1 /* 2 * net/key/af_key.c An implementation of PF_KEYv2 sockets. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Maxim Giryaev <gem@asplinux.ru> 10 * David S. Miller <davem@redhat.com> 11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> 14 * Derek Atkins <derek@ihtfp.com> 15 */ 16 17 #include <linux/capability.h> 18 #include <linux/module.h> 19 #include <linux/kernel.h> 20 #include <linux/socket.h> 21 #include <linux/pfkeyv2.h> 22 #include <linux/ipsec.h> 23 #include <linux/skbuff.h> 24 #include <linux/rtnetlink.h> 25 #include <linux/in.h> 26 #include <linux/in6.h> 27 #include <linux/proc_fs.h> 28 #include <linux/init.h> 29 #include <linux/slab.h> 30 #include <net/net_namespace.h> 31 #include <net/netns/generic.h> 32 #include <net/xfrm.h> 33 34 #include <net/sock.h> 35 36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 38 39 static unsigned int pfkey_net_id __read_mostly; 40 struct netns_pfkey { 41 /* List of all pfkey sockets. */ 42 struct hlist_head table; 43 atomic_t socks_nr; 44 }; 45 static DEFINE_MUTEX(pfkey_mutex); 46 47 #define DUMMY_MARK 0 48 static const struct xfrm_mark dummy_mark = {0, 0}; 49 struct pfkey_sock { 50 /* struct sock must be the first member of struct pfkey_sock */ 51 struct sock sk; 52 int registered; 53 int promisc; 54 55 struct { 56 uint8_t msg_version; 57 uint32_t msg_portid; 58 int (*dump)(struct pfkey_sock *sk); 59 void (*done)(struct pfkey_sock *sk); 60 union { 61 struct xfrm_policy_walk policy; 62 struct xfrm_state_walk state; 63 } u; 64 struct sk_buff *skb; 65 } dump; 66 struct mutex dump_lock; 67 }; 68 69 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 70 xfrm_address_t *saddr, xfrm_address_t *daddr, 71 u16 *family); 72 73 static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 74 { 75 return (struct pfkey_sock *)sk; 76 } 77 78 static int pfkey_can_dump(const struct sock *sk) 79 { 80 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf) 81 return 1; 82 return 0; 83 } 84 85 static void pfkey_terminate_dump(struct pfkey_sock *pfk) 86 { 87 if (pfk->dump.dump) { 88 if (pfk->dump.skb) { 89 kfree_skb(pfk->dump.skb); 90 pfk->dump.skb = NULL; 91 } 92 pfk->dump.done(pfk); 93 pfk->dump.dump = NULL; 94 pfk->dump.done = NULL; 95 } 96 } 97 98 static void pfkey_sock_destruct(struct sock *sk) 99 { 100 struct net *net = sock_net(sk); 101 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 102 103 pfkey_terminate_dump(pfkey_sk(sk)); 104 skb_queue_purge(&sk->sk_receive_queue); 105 106 if (!sock_flag(sk, SOCK_DEAD)) { 107 pr_err("Attempt to release alive pfkey socket: %p\n", sk); 108 return; 109 } 110 111 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 112 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 113 114 atomic_dec(&net_pfkey->socks_nr); 115 } 116 117 static const struct proto_ops pfkey_ops; 118 119 static void pfkey_insert(struct sock *sk) 120 { 121 struct net *net = sock_net(sk); 122 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 123 124 mutex_lock(&pfkey_mutex); 125 sk_add_node_rcu(sk, &net_pfkey->table); 126 mutex_unlock(&pfkey_mutex); 127 } 128 129 static void pfkey_remove(struct sock *sk) 130 { 131 mutex_lock(&pfkey_mutex); 132 sk_del_node_init_rcu(sk); 133 mutex_unlock(&pfkey_mutex); 134 } 135 136 static struct proto key_proto = { 137 .name = "KEY", 138 .owner = THIS_MODULE, 139 .obj_size = sizeof(struct pfkey_sock), 140 }; 141 142 static int pfkey_create(struct net *net, struct socket *sock, int protocol, 143 int kern) 144 { 145 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 146 struct sock *sk; 147 struct pfkey_sock *pfk; 148 int err; 149 150 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 151 return -EPERM; 152 if (sock->type != SOCK_RAW) 153 return -ESOCKTNOSUPPORT; 154 if (protocol != PF_KEY_V2) 155 return -EPROTONOSUPPORT; 156 157 err = -ENOMEM; 158 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern); 159 if (sk == NULL) 160 goto out; 161 162 pfk = pfkey_sk(sk); 163 mutex_init(&pfk->dump_lock); 164 165 sock->ops = &pfkey_ops; 166 sock_init_data(sock, sk); 167 168 sk->sk_family = PF_KEY; 169 sk->sk_destruct = pfkey_sock_destruct; 170 171 atomic_inc(&net_pfkey->socks_nr); 172 173 pfkey_insert(sk); 174 175 return 0; 176 out: 177 return err; 178 } 179 180 static int pfkey_release(struct socket *sock) 181 { 182 struct sock *sk = sock->sk; 183 184 if (!sk) 185 return 0; 186 187 pfkey_remove(sk); 188 189 sock_orphan(sk); 190 sock->sk = NULL; 191 skb_queue_purge(&sk->sk_write_queue); 192 193 synchronize_rcu(); 194 sock_put(sk); 195 196 return 0; 197 } 198 199 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation, 200 struct sock *sk) 201 { 202 int err = -ENOBUFS; 203 204 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) 205 return err; 206 207 skb = skb_clone(skb, allocation); 208 209 if (skb) { 210 skb_set_owner_r(skb, sk); 211 skb_queue_tail(&sk->sk_receive_queue, skb); 212 sk->sk_data_ready(sk); 213 err = 0; 214 } 215 return err; 216 } 217 218 /* Send SKB to all pfkey sockets matching selected criteria. */ 219 #define BROADCAST_ALL 0 220 #define BROADCAST_ONE 1 221 #define BROADCAST_REGISTERED 2 222 #define BROADCAST_PROMISC_ONLY 4 223 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 224 int broadcast_flags, struct sock *one_sk, 225 struct net *net) 226 { 227 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 228 struct sock *sk; 229 int err = -ESRCH; 230 231 /* XXX Do we need something like netlink_overrun? I think 232 * XXX PF_KEY socket apps will not mind current behavior. 233 */ 234 if (!skb) 235 return -ENOMEM; 236 237 rcu_read_lock(); 238 sk_for_each_rcu(sk, &net_pfkey->table) { 239 struct pfkey_sock *pfk = pfkey_sk(sk); 240 int err2; 241 242 /* Yes, it means that if you are meant to receive this 243 * pfkey message you receive it twice as promiscuous 244 * socket. 245 */ 246 if (pfk->promisc) 247 pfkey_broadcast_one(skb, GFP_ATOMIC, sk); 248 249 /* the exact target will be processed later */ 250 if (sk == one_sk) 251 continue; 252 if (broadcast_flags != BROADCAST_ALL) { 253 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 254 continue; 255 if ((broadcast_flags & BROADCAST_REGISTERED) && 256 !pfk->registered) 257 continue; 258 if (broadcast_flags & BROADCAST_ONE) 259 continue; 260 } 261 262 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk); 263 264 /* Error is cleared after successful sending to at least one 265 * registered KM */ 266 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 267 err = err2; 268 } 269 rcu_read_unlock(); 270 271 if (one_sk != NULL) 272 err = pfkey_broadcast_one(skb, allocation, one_sk); 273 274 kfree_skb(skb); 275 return err; 276 } 277 278 static int pfkey_do_dump(struct pfkey_sock *pfk) 279 { 280 struct sadb_msg *hdr; 281 int rc; 282 283 mutex_lock(&pfk->dump_lock); 284 if (!pfk->dump.dump) { 285 rc = 0; 286 goto out; 287 } 288 289 rc = pfk->dump.dump(pfk); 290 if (rc == -ENOBUFS) { 291 rc = 0; 292 goto out; 293 } 294 295 if (pfk->dump.skb) { 296 if (!pfkey_can_dump(&pfk->sk)) { 297 rc = 0; 298 goto out; 299 } 300 301 hdr = (struct sadb_msg *) pfk->dump.skb->data; 302 hdr->sadb_msg_seq = 0; 303 hdr->sadb_msg_errno = rc; 304 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 305 &pfk->sk, sock_net(&pfk->sk)); 306 pfk->dump.skb = NULL; 307 } 308 309 pfkey_terminate_dump(pfk); 310 311 out: 312 mutex_unlock(&pfk->dump_lock); 313 return rc; 314 } 315 316 static inline void pfkey_hdr_dup(struct sadb_msg *new, 317 const struct sadb_msg *orig) 318 { 319 *new = *orig; 320 } 321 322 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk) 323 { 324 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 325 struct sadb_msg *hdr; 326 327 if (!skb) 328 return -ENOBUFS; 329 330 /* Woe be to the platform trying to support PFKEY yet 331 * having normal errnos outside the 1-255 range, inclusive. 332 */ 333 err = -err; 334 if (err == ERESTARTSYS || 335 err == ERESTARTNOHAND || 336 err == ERESTARTNOINTR) 337 err = EINTR; 338 if (err >= 512) 339 err = EINVAL; 340 BUG_ON(err <= 0 || err >= 256); 341 342 hdr = skb_put(skb, sizeof(struct sadb_msg)); 343 pfkey_hdr_dup(hdr, orig); 344 hdr->sadb_msg_errno = (uint8_t) err; 345 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 346 sizeof(uint64_t)); 347 348 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk)); 349 350 return 0; 351 } 352 353 static const u8 sadb_ext_min_len[] = { 354 [SADB_EXT_RESERVED] = (u8) 0, 355 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 356 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 357 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 358 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 359 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 360 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 361 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 362 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 363 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 364 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 365 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 366 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 367 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 368 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 369 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 370 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 371 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 372 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 373 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 374 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 375 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 376 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 377 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 378 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 379 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress), 380 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter), 381 }; 382 383 /* Verify sadb_address_{len,prefixlen} against sa_family. */ 384 static int verify_address_len(const void *p) 385 { 386 const struct sadb_address *sp = p; 387 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1); 388 const struct sockaddr_in *sin; 389 #if IS_ENABLED(CONFIG_IPV6) 390 const struct sockaddr_in6 *sin6; 391 #endif 392 int len; 393 394 if (sp->sadb_address_len < 395 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family), 396 sizeof(uint64_t))) 397 return -EINVAL; 398 399 switch (addr->sa_family) { 400 case AF_INET: 401 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); 402 if (sp->sadb_address_len != len || 403 sp->sadb_address_prefixlen > 32) 404 return -EINVAL; 405 break; 406 #if IS_ENABLED(CONFIG_IPV6) 407 case AF_INET6: 408 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); 409 if (sp->sadb_address_len != len || 410 sp->sadb_address_prefixlen > 128) 411 return -EINVAL; 412 break; 413 #endif 414 default: 415 /* It is user using kernel to keep track of security 416 * associations for another protocol, such as 417 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 418 * lengths. 419 * 420 * XXX Actually, association/policy database is not yet 421 * XXX able to cope with arbitrary sockaddr families. 422 * XXX When it can, remove this -EINVAL. -DaveM 423 */ 424 return -EINVAL; 425 } 426 427 return 0; 428 } 429 430 static inline int sadb_key_len(const struct sadb_key *key) 431 { 432 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8); 433 434 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes, 435 sizeof(uint64_t)); 436 } 437 438 static int verify_key_len(const void *p) 439 { 440 const struct sadb_key *key = p; 441 442 if (sadb_key_len(key) > key->sadb_key_len) 443 return -EINVAL; 444 445 return 0; 446 } 447 448 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx) 449 { 450 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) + 451 sec_ctx->sadb_x_ctx_len, 452 sizeof(uint64_t)); 453 } 454 455 static inline int verify_sec_ctx_len(const void *p) 456 { 457 const struct sadb_x_sec_ctx *sec_ctx = p; 458 int len = sec_ctx->sadb_x_ctx_len; 459 460 if (len > PAGE_SIZE) 461 return -EINVAL; 462 463 len = pfkey_sec_ctx_len(sec_ctx); 464 465 if (sec_ctx->sadb_x_sec_len != len) 466 return -EINVAL; 467 468 return 0; 469 } 470 471 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx, 472 gfp_t gfp) 473 { 474 struct xfrm_user_sec_ctx *uctx = NULL; 475 int ctx_size = sec_ctx->sadb_x_ctx_len; 476 477 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp); 478 479 if (!uctx) 480 return NULL; 481 482 uctx->len = pfkey_sec_ctx_len(sec_ctx); 483 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 484 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 485 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 486 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 487 memcpy(uctx + 1, sec_ctx + 1, 488 uctx->ctx_len); 489 490 return uctx; 491 } 492 493 static int present_and_same_family(const struct sadb_address *src, 494 const struct sadb_address *dst) 495 { 496 const struct sockaddr *s_addr, *d_addr; 497 498 if (!src || !dst) 499 return 0; 500 501 s_addr = (const struct sockaddr *)(src + 1); 502 d_addr = (const struct sockaddr *)(dst + 1); 503 if (s_addr->sa_family != d_addr->sa_family) 504 return 0; 505 if (s_addr->sa_family != AF_INET 506 #if IS_ENABLED(CONFIG_IPV6) 507 && s_addr->sa_family != AF_INET6 508 #endif 509 ) 510 return 0; 511 512 return 1; 513 } 514 515 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs) 516 { 517 const char *p = (char *) hdr; 518 int len = skb->len; 519 520 len -= sizeof(*hdr); 521 p += sizeof(*hdr); 522 while (len > 0) { 523 const struct sadb_ext *ehdr = (const struct sadb_ext *) p; 524 uint16_t ext_type; 525 int ext_len; 526 527 if (len < sizeof(*ehdr)) 528 return -EINVAL; 529 530 ext_len = ehdr->sadb_ext_len; 531 ext_len *= sizeof(uint64_t); 532 ext_type = ehdr->sadb_ext_type; 533 if (ext_len < sizeof(uint64_t) || 534 ext_len > len || 535 ext_type == SADB_EXT_RESERVED) 536 return -EINVAL; 537 538 if (ext_type <= SADB_EXT_MAX) { 539 int min = (int) sadb_ext_min_len[ext_type]; 540 if (ext_len < min) 541 return -EINVAL; 542 if (ext_hdrs[ext_type-1] != NULL) 543 return -EINVAL; 544 switch (ext_type) { 545 case SADB_EXT_ADDRESS_SRC: 546 case SADB_EXT_ADDRESS_DST: 547 case SADB_EXT_ADDRESS_PROXY: 548 case SADB_X_EXT_NAT_T_OA: 549 if (verify_address_len(p)) 550 return -EINVAL; 551 break; 552 case SADB_X_EXT_SEC_CTX: 553 if (verify_sec_ctx_len(p)) 554 return -EINVAL; 555 break; 556 case SADB_EXT_KEY_AUTH: 557 case SADB_EXT_KEY_ENCRYPT: 558 if (verify_key_len(p)) 559 return -EINVAL; 560 break; 561 default: 562 break; 563 } 564 ext_hdrs[ext_type-1] = (void *) p; 565 } 566 p += ext_len; 567 len -= ext_len; 568 } 569 570 return 0; 571 } 572 573 static uint16_t 574 pfkey_satype2proto(uint8_t satype) 575 { 576 switch (satype) { 577 case SADB_SATYPE_UNSPEC: 578 return IPSEC_PROTO_ANY; 579 case SADB_SATYPE_AH: 580 return IPPROTO_AH; 581 case SADB_SATYPE_ESP: 582 return IPPROTO_ESP; 583 case SADB_X_SATYPE_IPCOMP: 584 return IPPROTO_COMP; 585 default: 586 return 0; 587 } 588 /* NOTREACHED */ 589 } 590 591 static uint8_t 592 pfkey_proto2satype(uint16_t proto) 593 { 594 switch (proto) { 595 case IPPROTO_AH: 596 return SADB_SATYPE_AH; 597 case IPPROTO_ESP: 598 return SADB_SATYPE_ESP; 599 case IPPROTO_COMP: 600 return SADB_X_SATYPE_IPCOMP; 601 default: 602 return 0; 603 } 604 /* NOTREACHED */ 605 } 606 607 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 608 * say specifically 'just raw sockets' as we encode them as 255. 609 */ 610 611 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 612 { 613 return proto == IPSEC_PROTO_ANY ? 0 : proto; 614 } 615 616 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 617 { 618 return proto ? proto : IPSEC_PROTO_ANY; 619 } 620 621 static inline int pfkey_sockaddr_len(sa_family_t family) 622 { 623 switch (family) { 624 case AF_INET: 625 return sizeof(struct sockaddr_in); 626 #if IS_ENABLED(CONFIG_IPV6) 627 case AF_INET6: 628 return sizeof(struct sockaddr_in6); 629 #endif 630 } 631 return 0; 632 } 633 634 static 635 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr) 636 { 637 switch (sa->sa_family) { 638 case AF_INET: 639 xaddr->a4 = 640 ((struct sockaddr_in *)sa)->sin_addr.s_addr; 641 return AF_INET; 642 #if IS_ENABLED(CONFIG_IPV6) 643 case AF_INET6: 644 memcpy(xaddr->a6, 645 &((struct sockaddr_in6 *)sa)->sin6_addr, 646 sizeof(struct in6_addr)); 647 return AF_INET6; 648 #endif 649 } 650 return 0; 651 } 652 653 static 654 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr) 655 { 656 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1), 657 xaddr); 658 } 659 660 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs) 661 { 662 const struct sadb_sa *sa; 663 const struct sadb_address *addr; 664 uint16_t proto; 665 unsigned short family; 666 xfrm_address_t *xaddr; 667 668 sa = ext_hdrs[SADB_EXT_SA - 1]; 669 if (sa == NULL) 670 return NULL; 671 672 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 673 if (proto == 0) 674 return NULL; 675 676 /* sadb_address_len should be checked by caller */ 677 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 678 if (addr == NULL) 679 return NULL; 680 681 family = ((const struct sockaddr *)(addr + 1))->sa_family; 682 switch (family) { 683 case AF_INET: 684 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr; 685 break; 686 #if IS_ENABLED(CONFIG_IPV6) 687 case AF_INET6: 688 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr; 689 break; 690 #endif 691 default: 692 xaddr = NULL; 693 } 694 695 if (!xaddr) 696 return NULL; 697 698 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family); 699 } 700 701 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 702 703 static int 704 pfkey_sockaddr_size(sa_family_t family) 705 { 706 return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); 707 } 708 709 static inline int pfkey_mode_from_xfrm(int mode) 710 { 711 switch(mode) { 712 case XFRM_MODE_TRANSPORT: 713 return IPSEC_MODE_TRANSPORT; 714 case XFRM_MODE_TUNNEL: 715 return IPSEC_MODE_TUNNEL; 716 case XFRM_MODE_BEET: 717 return IPSEC_MODE_BEET; 718 default: 719 return -1; 720 } 721 } 722 723 static inline int pfkey_mode_to_xfrm(int mode) 724 { 725 switch(mode) { 726 case IPSEC_MODE_ANY: /*XXX*/ 727 case IPSEC_MODE_TRANSPORT: 728 return XFRM_MODE_TRANSPORT; 729 case IPSEC_MODE_TUNNEL: 730 return XFRM_MODE_TUNNEL; 731 case IPSEC_MODE_BEET: 732 return XFRM_MODE_BEET; 733 default: 734 return -1; 735 } 736 } 737 738 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port, 739 struct sockaddr *sa, 740 unsigned short family) 741 { 742 switch (family) { 743 case AF_INET: 744 { 745 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 746 sin->sin_family = AF_INET; 747 sin->sin_port = port; 748 sin->sin_addr.s_addr = xaddr->a4; 749 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 750 return 32; 751 } 752 #if IS_ENABLED(CONFIG_IPV6) 753 case AF_INET6: 754 { 755 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 756 sin6->sin6_family = AF_INET6; 757 sin6->sin6_port = port; 758 sin6->sin6_flowinfo = 0; 759 sin6->sin6_addr = xaddr->in6; 760 sin6->sin6_scope_id = 0; 761 return 128; 762 } 763 #endif 764 } 765 return 0; 766 } 767 768 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x, 769 int add_keys, int hsc) 770 { 771 struct sk_buff *skb; 772 struct sadb_msg *hdr; 773 struct sadb_sa *sa; 774 struct sadb_lifetime *lifetime; 775 struct sadb_address *addr; 776 struct sadb_key *key; 777 struct sadb_x_sa2 *sa2; 778 struct sadb_x_sec_ctx *sec_ctx; 779 struct xfrm_sec_ctx *xfrm_ctx; 780 int ctx_size = 0; 781 int size; 782 int auth_key_size = 0; 783 int encrypt_key_size = 0; 784 int sockaddr_size; 785 struct xfrm_encap_tmpl *natt = NULL; 786 int mode; 787 788 /* address family check */ 789 sockaddr_size = pfkey_sockaddr_size(x->props.family); 790 if (!sockaddr_size) 791 return ERR_PTR(-EINVAL); 792 793 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 794 key(AE), (identity(SD),) (sensitivity)> */ 795 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 796 sizeof(struct sadb_lifetime) + 797 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 798 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 799 sizeof(struct sadb_address)*2 + 800 sockaddr_size*2 + 801 sizeof(struct sadb_x_sa2); 802 803 if ((xfrm_ctx = x->security)) { 804 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 805 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 806 } 807 808 /* identity & sensitivity */ 809 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family)) 810 size += sizeof(struct sadb_address) + sockaddr_size; 811 812 if (add_keys) { 813 if (x->aalg && x->aalg->alg_key_len) { 814 auth_key_size = 815 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 816 size += sizeof(struct sadb_key) + auth_key_size; 817 } 818 if (x->ealg && x->ealg->alg_key_len) { 819 encrypt_key_size = 820 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 821 size += sizeof(struct sadb_key) + encrypt_key_size; 822 } 823 } 824 if (x->encap) 825 natt = x->encap; 826 827 if (natt && natt->encap_type) { 828 size += sizeof(struct sadb_x_nat_t_type); 829 size += sizeof(struct sadb_x_nat_t_port); 830 size += sizeof(struct sadb_x_nat_t_port); 831 } 832 833 skb = alloc_skb(size + 16, GFP_ATOMIC); 834 if (skb == NULL) 835 return ERR_PTR(-ENOBUFS); 836 837 /* call should fill header later */ 838 hdr = skb_put(skb, sizeof(struct sadb_msg)); 839 memset(hdr, 0, size); /* XXX do we need this ? */ 840 hdr->sadb_msg_len = size / sizeof(uint64_t); 841 842 /* sa */ 843 sa = skb_put(skb, sizeof(struct sadb_sa)); 844 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 845 sa->sadb_sa_exttype = SADB_EXT_SA; 846 sa->sadb_sa_spi = x->id.spi; 847 sa->sadb_sa_replay = x->props.replay_window; 848 switch (x->km.state) { 849 case XFRM_STATE_VALID: 850 sa->sadb_sa_state = x->km.dying ? 851 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 852 break; 853 case XFRM_STATE_ACQ: 854 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 855 break; 856 default: 857 sa->sadb_sa_state = SADB_SASTATE_DEAD; 858 break; 859 } 860 sa->sadb_sa_auth = 0; 861 if (x->aalg) { 862 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 863 sa->sadb_sa_auth = (a && a->pfkey_supported) ? 864 a->desc.sadb_alg_id : 0; 865 } 866 sa->sadb_sa_encrypt = 0; 867 BUG_ON(x->ealg && x->calg); 868 if (x->ealg) { 869 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 870 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 871 a->desc.sadb_alg_id : 0; 872 } 873 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 874 if (x->calg) { 875 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 876 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 877 a->desc.sadb_alg_id : 0; 878 } 879 880 sa->sadb_sa_flags = 0; 881 if (x->props.flags & XFRM_STATE_NOECN) 882 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 883 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 884 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 885 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 886 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 887 888 /* hard time */ 889 if (hsc & 2) { 890 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 891 lifetime->sadb_lifetime_len = 892 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 893 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 894 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 895 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 896 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 897 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 898 } 899 /* soft time */ 900 if (hsc & 1) { 901 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 902 lifetime->sadb_lifetime_len = 903 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 904 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 905 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 906 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 907 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 908 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 909 } 910 /* current time */ 911 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 912 lifetime->sadb_lifetime_len = 913 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 914 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 915 lifetime->sadb_lifetime_allocations = x->curlft.packets; 916 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 917 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 918 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 919 /* src address */ 920 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 921 addr->sadb_address_len = 922 (sizeof(struct sadb_address)+sockaddr_size)/ 923 sizeof(uint64_t); 924 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 925 /* "if the ports are non-zero, then the sadb_address_proto field, 926 normally zero, MUST be filled in with the transport 927 protocol's number." - RFC2367 */ 928 addr->sadb_address_proto = 0; 929 addr->sadb_address_reserved = 0; 930 931 addr->sadb_address_prefixlen = 932 pfkey_sockaddr_fill(&x->props.saddr, 0, 933 (struct sockaddr *) (addr + 1), 934 x->props.family); 935 if (!addr->sadb_address_prefixlen) 936 BUG(); 937 938 /* dst address */ 939 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 940 addr->sadb_address_len = 941 (sizeof(struct sadb_address)+sockaddr_size)/ 942 sizeof(uint64_t); 943 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 944 addr->sadb_address_proto = 0; 945 addr->sadb_address_reserved = 0; 946 947 addr->sadb_address_prefixlen = 948 pfkey_sockaddr_fill(&x->id.daddr, 0, 949 (struct sockaddr *) (addr + 1), 950 x->props.family); 951 if (!addr->sadb_address_prefixlen) 952 BUG(); 953 954 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, 955 x->props.family)) { 956 addr = skb_put(skb, 957 sizeof(struct sadb_address) + sockaddr_size); 958 addr->sadb_address_len = 959 (sizeof(struct sadb_address)+sockaddr_size)/ 960 sizeof(uint64_t); 961 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 962 addr->sadb_address_proto = 963 pfkey_proto_from_xfrm(x->sel.proto); 964 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 965 addr->sadb_address_reserved = 0; 966 967 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, 968 (struct sockaddr *) (addr + 1), 969 x->props.family); 970 } 971 972 /* auth key */ 973 if (add_keys && auth_key_size) { 974 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size); 975 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 976 sizeof(uint64_t); 977 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 978 key->sadb_key_bits = x->aalg->alg_key_len; 979 key->sadb_key_reserved = 0; 980 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 981 } 982 /* encrypt key */ 983 if (add_keys && encrypt_key_size) { 984 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size); 985 key->sadb_key_len = (sizeof(struct sadb_key) + 986 encrypt_key_size) / sizeof(uint64_t); 987 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 988 key->sadb_key_bits = x->ealg->alg_key_len; 989 key->sadb_key_reserved = 0; 990 memcpy(key + 1, x->ealg->alg_key, 991 (x->ealg->alg_key_len+7)/8); 992 } 993 994 /* sa */ 995 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2)); 996 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 997 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 998 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { 999 kfree_skb(skb); 1000 return ERR_PTR(-EINVAL); 1001 } 1002 sa2->sadb_x_sa2_mode = mode; 1003 sa2->sadb_x_sa2_reserved1 = 0; 1004 sa2->sadb_x_sa2_reserved2 = 0; 1005 sa2->sadb_x_sa2_sequence = 0; 1006 sa2->sadb_x_sa2_reqid = x->props.reqid; 1007 1008 if (natt && natt->encap_type) { 1009 struct sadb_x_nat_t_type *n_type; 1010 struct sadb_x_nat_t_port *n_port; 1011 1012 /* type */ 1013 n_type = skb_put(skb, sizeof(*n_type)); 1014 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 1015 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 1016 n_type->sadb_x_nat_t_type_type = natt->encap_type; 1017 n_type->sadb_x_nat_t_type_reserved[0] = 0; 1018 n_type->sadb_x_nat_t_type_reserved[1] = 0; 1019 n_type->sadb_x_nat_t_type_reserved[2] = 0; 1020 1021 /* source port */ 1022 n_port = skb_put(skb, sizeof(*n_port)); 1023 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1024 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 1025 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 1026 n_port->sadb_x_nat_t_port_reserved = 0; 1027 1028 /* dest port */ 1029 n_port = skb_put(skb, sizeof(*n_port)); 1030 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1031 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 1032 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 1033 n_port->sadb_x_nat_t_port_reserved = 0; 1034 } 1035 1036 /* security context */ 1037 if (xfrm_ctx) { 1038 sec_ctx = skb_put(skb, 1039 sizeof(struct sadb_x_sec_ctx) + ctx_size); 1040 sec_ctx->sadb_x_sec_len = 1041 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 1042 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 1043 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 1044 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 1045 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 1046 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 1047 xfrm_ctx->ctx_len); 1048 } 1049 1050 return skb; 1051 } 1052 1053 1054 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) 1055 { 1056 struct sk_buff *skb; 1057 1058 skb = __pfkey_xfrm_state2msg(x, 1, 3); 1059 1060 return skb; 1061 } 1062 1063 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, 1064 int hsc) 1065 { 1066 return __pfkey_xfrm_state2msg(x, 0, hsc); 1067 } 1068 1069 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, 1070 const struct sadb_msg *hdr, 1071 void * const *ext_hdrs) 1072 { 1073 struct xfrm_state *x; 1074 const struct sadb_lifetime *lifetime; 1075 const struct sadb_sa *sa; 1076 const struct sadb_key *key; 1077 const struct sadb_x_sec_ctx *sec_ctx; 1078 uint16_t proto; 1079 int err; 1080 1081 1082 sa = ext_hdrs[SADB_EXT_SA - 1]; 1083 if (!sa || 1084 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1085 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1086 return ERR_PTR(-EINVAL); 1087 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1088 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1089 return ERR_PTR(-EINVAL); 1090 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1091 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1092 return ERR_PTR(-EINVAL); 1093 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1094 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1095 return ERR_PTR(-EINVAL); 1096 1097 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1098 if (proto == 0) 1099 return ERR_PTR(-EINVAL); 1100 1101 /* default error is no buffer space */ 1102 err = -ENOBUFS; 1103 1104 /* RFC2367: 1105 1106 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1107 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1108 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1109 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1110 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1111 not true. 1112 1113 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1114 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1115 */ 1116 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1117 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1118 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1119 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1120 return ERR_PTR(-EINVAL); 1121 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1122 if (key != NULL && 1123 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1124 key->sadb_key_bits == 0) 1125 return ERR_PTR(-EINVAL); 1126 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1127 if (key != NULL && 1128 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1129 key->sadb_key_bits == 0) 1130 return ERR_PTR(-EINVAL); 1131 1132 x = xfrm_state_alloc(net); 1133 if (x == NULL) 1134 return ERR_PTR(-ENOBUFS); 1135 1136 x->id.proto = proto; 1137 x->id.spi = sa->sadb_sa_spi; 1138 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, 1139 (sizeof(x->replay.bitmap) * 8)); 1140 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1141 x->props.flags |= XFRM_STATE_NOECN; 1142 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1143 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1144 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1145 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1146 1147 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; 1148 if (lifetime != NULL) { 1149 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1150 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1151 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1152 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1153 } 1154 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; 1155 if (lifetime != NULL) { 1156 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1157 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1158 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1159 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1160 } 1161 1162 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 1163 if (sec_ctx != NULL) { 1164 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 1165 1166 if (!uctx) 1167 goto out; 1168 1169 err = security_xfrm_state_alloc(x, uctx); 1170 kfree(uctx); 1171 1172 if (err) 1173 goto out; 1174 } 1175 1176 err = -ENOBUFS; 1177 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1178 if (sa->sadb_sa_auth) { 1179 int keysize = 0; 1180 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1181 if (!a || !a->pfkey_supported) { 1182 err = -ENOSYS; 1183 goto out; 1184 } 1185 if (key) 1186 keysize = (key->sadb_key_bits + 7) / 8; 1187 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1188 if (!x->aalg) { 1189 err = -ENOMEM; 1190 goto out; 1191 } 1192 strcpy(x->aalg->alg_name, a->name); 1193 x->aalg->alg_key_len = 0; 1194 if (key) { 1195 x->aalg->alg_key_len = key->sadb_key_bits; 1196 memcpy(x->aalg->alg_key, key+1, keysize); 1197 } 1198 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1199 x->props.aalgo = sa->sadb_sa_auth; 1200 /* x->algo.flags = sa->sadb_sa_flags; */ 1201 } 1202 if (sa->sadb_sa_encrypt) { 1203 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1204 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1205 if (!a || !a->pfkey_supported) { 1206 err = -ENOSYS; 1207 goto out; 1208 } 1209 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1210 if (!x->calg) { 1211 err = -ENOMEM; 1212 goto out; 1213 } 1214 strcpy(x->calg->alg_name, a->name); 1215 x->props.calgo = sa->sadb_sa_encrypt; 1216 } else { 1217 int keysize = 0; 1218 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1219 if (!a || !a->pfkey_supported) { 1220 err = -ENOSYS; 1221 goto out; 1222 } 1223 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1224 if (key) 1225 keysize = (key->sadb_key_bits + 7) / 8; 1226 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1227 if (!x->ealg) { 1228 err = -ENOMEM; 1229 goto out; 1230 } 1231 strcpy(x->ealg->alg_name, a->name); 1232 x->ealg->alg_key_len = 0; 1233 if (key) { 1234 x->ealg->alg_key_len = key->sadb_key_bits; 1235 memcpy(x->ealg->alg_key, key+1, keysize); 1236 } 1237 x->props.ealgo = sa->sadb_sa_encrypt; 1238 x->geniv = a->uinfo.encr.geniv; 1239 } 1240 } 1241 /* x->algo.flags = sa->sadb_sa_flags; */ 1242 1243 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1244 &x->props.saddr); 1245 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1246 &x->id.daddr); 1247 1248 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1249 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1250 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1251 if (mode < 0) { 1252 err = -EINVAL; 1253 goto out; 1254 } 1255 x->props.mode = mode; 1256 x->props.reqid = sa2->sadb_x_sa2_reqid; 1257 } 1258 1259 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1260 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1261 1262 /* Nobody uses this, but we try. */ 1263 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1264 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1265 } 1266 1267 if (!x->sel.family) 1268 x->sel.family = x->props.family; 1269 1270 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1271 const struct sadb_x_nat_t_type* n_type; 1272 struct xfrm_encap_tmpl *natt; 1273 1274 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1275 if (!x->encap) { 1276 err = -ENOMEM; 1277 goto out; 1278 } 1279 1280 natt = x->encap; 1281 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1282 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1283 1284 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1285 const struct sadb_x_nat_t_port *n_port = 1286 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1287 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1288 } 1289 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1290 const struct sadb_x_nat_t_port *n_port = 1291 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1292 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1293 } 1294 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1295 } 1296 1297 err = xfrm_init_state(x); 1298 if (err) 1299 goto out; 1300 1301 x->km.seq = hdr->sadb_msg_seq; 1302 return x; 1303 1304 out: 1305 x->km.state = XFRM_STATE_DEAD; 1306 xfrm_state_put(x); 1307 return ERR_PTR(err); 1308 } 1309 1310 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1311 { 1312 return -EOPNOTSUPP; 1313 } 1314 1315 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1316 { 1317 struct net *net = sock_net(sk); 1318 struct sk_buff *resp_skb; 1319 struct sadb_x_sa2 *sa2; 1320 struct sadb_address *saddr, *daddr; 1321 struct sadb_msg *out_hdr; 1322 struct sadb_spirange *range; 1323 struct xfrm_state *x = NULL; 1324 int mode; 1325 int err; 1326 u32 min_spi, max_spi; 1327 u32 reqid; 1328 u8 proto; 1329 unsigned short family; 1330 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1331 1332 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1333 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1334 return -EINVAL; 1335 1336 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1337 if (proto == 0) 1338 return -EINVAL; 1339 1340 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1341 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1342 if (mode < 0) 1343 return -EINVAL; 1344 reqid = sa2->sadb_x_sa2_reqid; 1345 } else { 1346 mode = 0; 1347 reqid = 0; 1348 } 1349 1350 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1351 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1352 1353 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1354 switch (family) { 1355 case AF_INET: 1356 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1357 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1358 break; 1359 #if IS_ENABLED(CONFIG_IPV6) 1360 case AF_INET6: 1361 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1362 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1363 break; 1364 #endif 1365 } 1366 1367 if (hdr->sadb_msg_seq) { 1368 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1369 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1370 xfrm_state_put(x); 1371 x = NULL; 1372 } 1373 } 1374 1375 if (!x) 1376 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family); 1377 1378 if (x == NULL) 1379 return -ENOENT; 1380 1381 min_spi = 0x100; 1382 max_spi = 0x0fffffff; 1383 1384 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1385 if (range) { 1386 min_spi = range->sadb_spirange_min; 1387 max_spi = range->sadb_spirange_max; 1388 } 1389 1390 err = verify_spi_info(x->id.proto, min_spi, max_spi); 1391 if (err) { 1392 xfrm_state_put(x); 1393 return err; 1394 } 1395 1396 err = xfrm_alloc_spi(x, min_spi, max_spi); 1397 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1398 1399 if (IS_ERR(resp_skb)) { 1400 xfrm_state_put(x); 1401 return PTR_ERR(resp_skb); 1402 } 1403 1404 out_hdr = (struct sadb_msg *) resp_skb->data; 1405 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1406 out_hdr->sadb_msg_type = SADB_GETSPI; 1407 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1408 out_hdr->sadb_msg_errno = 0; 1409 out_hdr->sadb_msg_reserved = 0; 1410 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1411 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1412 1413 xfrm_state_put(x); 1414 1415 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1416 1417 return 0; 1418 } 1419 1420 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1421 { 1422 struct net *net = sock_net(sk); 1423 struct xfrm_state *x; 1424 1425 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1426 return -EOPNOTSUPP; 1427 1428 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1429 return 0; 1430 1431 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1432 if (x == NULL) 1433 return 0; 1434 1435 spin_lock_bh(&x->lock); 1436 if (x->km.state == XFRM_STATE_ACQ) 1437 x->km.state = XFRM_STATE_ERROR; 1438 1439 spin_unlock_bh(&x->lock); 1440 xfrm_state_put(x); 1441 return 0; 1442 } 1443 1444 static inline int event2poltype(int event) 1445 { 1446 switch (event) { 1447 case XFRM_MSG_DELPOLICY: 1448 return SADB_X_SPDDELETE; 1449 case XFRM_MSG_NEWPOLICY: 1450 return SADB_X_SPDADD; 1451 case XFRM_MSG_UPDPOLICY: 1452 return SADB_X_SPDUPDATE; 1453 case XFRM_MSG_POLEXPIRE: 1454 // return SADB_X_SPDEXPIRE; 1455 default: 1456 pr_err("pfkey: Unknown policy event %d\n", event); 1457 break; 1458 } 1459 1460 return 0; 1461 } 1462 1463 static inline int event2keytype(int event) 1464 { 1465 switch (event) { 1466 case XFRM_MSG_DELSA: 1467 return SADB_DELETE; 1468 case XFRM_MSG_NEWSA: 1469 return SADB_ADD; 1470 case XFRM_MSG_UPDSA: 1471 return SADB_UPDATE; 1472 case XFRM_MSG_EXPIRE: 1473 return SADB_EXPIRE; 1474 default: 1475 pr_err("pfkey: Unknown SA event %d\n", event); 1476 break; 1477 } 1478 1479 return 0; 1480 } 1481 1482 /* ADD/UPD/DEL */ 1483 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1484 { 1485 struct sk_buff *skb; 1486 struct sadb_msg *hdr; 1487 1488 skb = pfkey_xfrm_state2msg(x); 1489 1490 if (IS_ERR(skb)) 1491 return PTR_ERR(skb); 1492 1493 hdr = (struct sadb_msg *) skb->data; 1494 hdr->sadb_msg_version = PF_KEY_V2; 1495 hdr->sadb_msg_type = event2keytype(c->event); 1496 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1497 hdr->sadb_msg_errno = 0; 1498 hdr->sadb_msg_reserved = 0; 1499 hdr->sadb_msg_seq = c->seq; 1500 hdr->sadb_msg_pid = c->portid; 1501 1502 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1503 1504 return 0; 1505 } 1506 1507 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1508 { 1509 struct net *net = sock_net(sk); 1510 struct xfrm_state *x; 1511 int err; 1512 struct km_event c; 1513 1514 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1515 if (IS_ERR(x)) 1516 return PTR_ERR(x); 1517 1518 xfrm_state_hold(x); 1519 if (hdr->sadb_msg_type == SADB_ADD) 1520 err = xfrm_state_add(x); 1521 else 1522 err = xfrm_state_update(x); 1523 1524 xfrm_audit_state_add(x, err ? 0 : 1, true); 1525 1526 if (err < 0) { 1527 x->km.state = XFRM_STATE_DEAD; 1528 __xfrm_state_put(x); 1529 goto out; 1530 } 1531 1532 if (hdr->sadb_msg_type == SADB_ADD) 1533 c.event = XFRM_MSG_NEWSA; 1534 else 1535 c.event = XFRM_MSG_UPDSA; 1536 c.seq = hdr->sadb_msg_seq; 1537 c.portid = hdr->sadb_msg_pid; 1538 km_state_notify(x, &c); 1539 out: 1540 xfrm_state_put(x); 1541 return err; 1542 } 1543 1544 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1545 { 1546 struct net *net = sock_net(sk); 1547 struct xfrm_state *x; 1548 struct km_event c; 1549 int err; 1550 1551 if (!ext_hdrs[SADB_EXT_SA-1] || 1552 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1553 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1554 return -EINVAL; 1555 1556 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1557 if (x == NULL) 1558 return -ESRCH; 1559 1560 if ((err = security_xfrm_state_delete(x))) 1561 goto out; 1562 1563 if (xfrm_state_kern(x)) { 1564 err = -EPERM; 1565 goto out; 1566 } 1567 1568 err = xfrm_state_delete(x); 1569 1570 if (err < 0) 1571 goto out; 1572 1573 c.seq = hdr->sadb_msg_seq; 1574 c.portid = hdr->sadb_msg_pid; 1575 c.event = XFRM_MSG_DELSA; 1576 km_state_notify(x, &c); 1577 out: 1578 xfrm_audit_state_delete(x, err ? 0 : 1, true); 1579 xfrm_state_put(x); 1580 1581 return err; 1582 } 1583 1584 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1585 { 1586 struct net *net = sock_net(sk); 1587 __u8 proto; 1588 struct sk_buff *out_skb; 1589 struct sadb_msg *out_hdr; 1590 struct xfrm_state *x; 1591 1592 if (!ext_hdrs[SADB_EXT_SA-1] || 1593 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1594 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1595 return -EINVAL; 1596 1597 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1598 if (x == NULL) 1599 return -ESRCH; 1600 1601 out_skb = pfkey_xfrm_state2msg(x); 1602 proto = x->id.proto; 1603 xfrm_state_put(x); 1604 if (IS_ERR(out_skb)) 1605 return PTR_ERR(out_skb); 1606 1607 out_hdr = (struct sadb_msg *) out_skb->data; 1608 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1609 out_hdr->sadb_msg_type = SADB_GET; 1610 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1611 out_hdr->sadb_msg_errno = 0; 1612 out_hdr->sadb_msg_reserved = 0; 1613 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1614 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1615 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1616 1617 return 0; 1618 } 1619 1620 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1621 gfp_t allocation) 1622 { 1623 struct sk_buff *skb; 1624 struct sadb_msg *hdr; 1625 int len, auth_len, enc_len, i; 1626 1627 auth_len = xfrm_count_pfkey_auth_supported(); 1628 if (auth_len) { 1629 auth_len *= sizeof(struct sadb_alg); 1630 auth_len += sizeof(struct sadb_supported); 1631 } 1632 1633 enc_len = xfrm_count_pfkey_enc_supported(); 1634 if (enc_len) { 1635 enc_len *= sizeof(struct sadb_alg); 1636 enc_len += sizeof(struct sadb_supported); 1637 } 1638 1639 len = enc_len + auth_len + sizeof(struct sadb_msg); 1640 1641 skb = alloc_skb(len + 16, allocation); 1642 if (!skb) 1643 goto out_put_algs; 1644 1645 hdr = skb_put(skb, sizeof(*hdr)); 1646 pfkey_hdr_dup(hdr, orig); 1647 hdr->sadb_msg_errno = 0; 1648 hdr->sadb_msg_len = len / sizeof(uint64_t); 1649 1650 if (auth_len) { 1651 struct sadb_supported *sp; 1652 struct sadb_alg *ap; 1653 1654 sp = skb_put(skb, auth_len); 1655 ap = (struct sadb_alg *) (sp + 1); 1656 1657 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1658 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1659 1660 for (i = 0; ; i++) { 1661 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1662 if (!aalg) 1663 break; 1664 if (!aalg->pfkey_supported) 1665 continue; 1666 if (aalg->available) 1667 *ap++ = aalg->desc; 1668 } 1669 } 1670 1671 if (enc_len) { 1672 struct sadb_supported *sp; 1673 struct sadb_alg *ap; 1674 1675 sp = skb_put(skb, enc_len); 1676 ap = (struct sadb_alg *) (sp + 1); 1677 1678 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1679 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1680 1681 for (i = 0; ; i++) { 1682 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1683 if (!ealg) 1684 break; 1685 if (!ealg->pfkey_supported) 1686 continue; 1687 if (ealg->available) 1688 *ap++ = ealg->desc; 1689 } 1690 } 1691 1692 out_put_algs: 1693 return skb; 1694 } 1695 1696 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1697 { 1698 struct pfkey_sock *pfk = pfkey_sk(sk); 1699 struct sk_buff *supp_skb; 1700 1701 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1702 return -EINVAL; 1703 1704 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1705 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1706 return -EEXIST; 1707 pfk->registered |= (1<<hdr->sadb_msg_satype); 1708 } 1709 1710 xfrm_probe_algs(); 1711 1712 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1713 if (!supp_skb) { 1714 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1715 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1716 1717 return -ENOBUFS; 1718 } 1719 1720 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, 1721 sock_net(sk)); 1722 return 0; 1723 } 1724 1725 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1726 { 1727 struct sk_buff *skb; 1728 struct sadb_msg *hdr; 1729 1730 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1731 if (!skb) 1732 return -ENOBUFS; 1733 1734 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg)); 1735 hdr->sadb_msg_errno = (uint8_t) 0; 1736 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1737 1738 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, 1739 sock_net(sk)); 1740 } 1741 1742 static int key_notify_sa_flush(const struct km_event *c) 1743 { 1744 struct sk_buff *skb; 1745 struct sadb_msg *hdr; 1746 1747 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1748 if (!skb) 1749 return -ENOBUFS; 1750 hdr = skb_put(skb, sizeof(struct sadb_msg)); 1751 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1752 hdr->sadb_msg_type = SADB_FLUSH; 1753 hdr->sadb_msg_seq = c->seq; 1754 hdr->sadb_msg_pid = c->portid; 1755 hdr->sadb_msg_version = PF_KEY_V2; 1756 hdr->sadb_msg_errno = (uint8_t) 0; 1757 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1758 hdr->sadb_msg_reserved = 0; 1759 1760 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1761 1762 return 0; 1763 } 1764 1765 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1766 { 1767 struct net *net = sock_net(sk); 1768 unsigned int proto; 1769 struct km_event c; 1770 int err, err2; 1771 1772 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1773 if (proto == 0) 1774 return -EINVAL; 1775 1776 err = xfrm_state_flush(net, proto, true, false); 1777 err2 = unicast_flush_resp(sk, hdr); 1778 if (err || err2) { 1779 if (err == -ESRCH) /* empty table - go quietly */ 1780 err = 0; 1781 return err ? err : err2; 1782 } 1783 1784 c.data.proto = proto; 1785 c.seq = hdr->sadb_msg_seq; 1786 c.portid = hdr->sadb_msg_pid; 1787 c.event = XFRM_MSG_FLUSHSA; 1788 c.net = net; 1789 km_state_notify(NULL, &c); 1790 1791 return 0; 1792 } 1793 1794 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1795 { 1796 struct pfkey_sock *pfk = ptr; 1797 struct sk_buff *out_skb; 1798 struct sadb_msg *out_hdr; 1799 1800 if (!pfkey_can_dump(&pfk->sk)) 1801 return -ENOBUFS; 1802 1803 out_skb = pfkey_xfrm_state2msg(x); 1804 if (IS_ERR(out_skb)) 1805 return PTR_ERR(out_skb); 1806 1807 out_hdr = (struct sadb_msg *) out_skb->data; 1808 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1809 out_hdr->sadb_msg_type = SADB_DUMP; 1810 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1811 out_hdr->sadb_msg_errno = 0; 1812 out_hdr->sadb_msg_reserved = 0; 1813 out_hdr->sadb_msg_seq = count + 1; 1814 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1815 1816 if (pfk->dump.skb) 1817 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1818 &pfk->sk, sock_net(&pfk->sk)); 1819 pfk->dump.skb = out_skb; 1820 1821 return 0; 1822 } 1823 1824 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1825 { 1826 struct net *net = sock_net(&pfk->sk); 1827 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1828 } 1829 1830 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1831 { 1832 struct net *net = sock_net(&pfk->sk); 1833 1834 xfrm_state_walk_done(&pfk->dump.u.state, net); 1835 } 1836 1837 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1838 { 1839 u8 proto; 1840 struct xfrm_address_filter *filter = NULL; 1841 struct pfkey_sock *pfk = pfkey_sk(sk); 1842 1843 mutex_lock(&pfk->dump_lock); 1844 if (pfk->dump.dump != NULL) { 1845 mutex_unlock(&pfk->dump_lock); 1846 return -EBUSY; 1847 } 1848 1849 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1850 if (proto == 0) { 1851 mutex_unlock(&pfk->dump_lock); 1852 return -EINVAL; 1853 } 1854 1855 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { 1856 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; 1857 1858 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 1859 if (filter == NULL) { 1860 mutex_unlock(&pfk->dump_lock); 1861 return -ENOMEM; 1862 } 1863 1864 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1865 sizeof(xfrm_address_t)); 1866 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1867 sizeof(xfrm_address_t)); 1868 filter->family = xfilter->sadb_x_filter_family; 1869 filter->splen = xfilter->sadb_x_filter_splen; 1870 filter->dplen = xfilter->sadb_x_filter_dplen; 1871 } 1872 1873 pfk->dump.msg_version = hdr->sadb_msg_version; 1874 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1875 pfk->dump.dump = pfkey_dump_sa; 1876 pfk->dump.done = pfkey_dump_sa_done; 1877 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1878 mutex_unlock(&pfk->dump_lock); 1879 1880 return pfkey_do_dump(pfk); 1881 } 1882 1883 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1884 { 1885 struct pfkey_sock *pfk = pfkey_sk(sk); 1886 int satype = hdr->sadb_msg_satype; 1887 bool reset_errno = false; 1888 1889 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1890 reset_errno = true; 1891 if (satype != 0 && satype != 1) 1892 return -EINVAL; 1893 pfk->promisc = satype; 1894 } 1895 if (reset_errno && skb_cloned(skb)) 1896 skb = skb_copy(skb, GFP_KERNEL); 1897 else 1898 skb = skb_clone(skb, GFP_KERNEL); 1899 1900 if (reset_errno && skb) { 1901 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1902 new_hdr->sadb_msg_errno = 0; 1903 } 1904 1905 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1906 return 0; 1907 } 1908 1909 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1910 { 1911 int i; 1912 u32 reqid = *(u32*)ptr; 1913 1914 for (i=0; i<xp->xfrm_nr; i++) { 1915 if (xp->xfrm_vec[i].reqid == reqid) 1916 return -EEXIST; 1917 } 1918 return 0; 1919 } 1920 1921 static u32 gen_reqid(struct net *net) 1922 { 1923 struct xfrm_policy_walk walk; 1924 u32 start; 1925 int rc; 1926 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1927 1928 start = reqid; 1929 do { 1930 ++reqid; 1931 if (reqid == 0) 1932 reqid = IPSEC_MANUAL_REQID_MAX+1; 1933 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1934 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1935 xfrm_policy_walk_done(&walk, net); 1936 if (rc != -EEXIST) 1937 return reqid; 1938 } while (reqid != start); 1939 return 0; 1940 } 1941 1942 static int 1943 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1944 { 1945 struct net *net = xp_net(xp); 1946 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1947 int mode; 1948 1949 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1950 return -ELOOP; 1951 1952 if (rq->sadb_x_ipsecrequest_mode == 0) 1953 return -EINVAL; 1954 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto)) 1955 return -EINVAL; 1956 1957 t->id.proto = rq->sadb_x_ipsecrequest_proto; 1958 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1959 return -EINVAL; 1960 t->mode = mode; 1961 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1962 t->optional = 1; 1963 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1964 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1965 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1966 t->reqid = 0; 1967 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1968 return -ENOBUFS; 1969 } 1970 1971 /* addresses present only in tunnel mode */ 1972 if (t->mode == XFRM_MODE_TUNNEL) { 1973 int err; 1974 1975 err = parse_sockaddr_pair( 1976 (struct sockaddr *)(rq + 1), 1977 rq->sadb_x_ipsecrequest_len - sizeof(*rq), 1978 &t->saddr, &t->id.daddr, &t->encap_family); 1979 if (err) 1980 return err; 1981 } else 1982 t->encap_family = xp->family; 1983 1984 /* No way to set this via kame pfkey */ 1985 t->allalgs = 1; 1986 xp->xfrm_nr++; 1987 return 0; 1988 } 1989 1990 static int 1991 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1992 { 1993 int err; 1994 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1995 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1996 1997 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 1998 return -EINVAL; 1999 2000 while (len >= sizeof(*rq)) { 2001 if (len < rq->sadb_x_ipsecrequest_len || 2002 rq->sadb_x_ipsecrequest_len < sizeof(*rq)) 2003 return -EINVAL; 2004 2005 if ((err = parse_ipsecrequest(xp, rq)) < 0) 2006 return err; 2007 len -= rq->sadb_x_ipsecrequest_len; 2008 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 2009 } 2010 return 0; 2011 } 2012 2013 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 2014 { 2015 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 2016 2017 if (xfrm_ctx) { 2018 int len = sizeof(struct sadb_x_sec_ctx); 2019 len += xfrm_ctx->ctx_len; 2020 return PFKEY_ALIGN8(len); 2021 } 2022 return 0; 2023 } 2024 2025 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 2026 { 2027 const struct xfrm_tmpl *t; 2028 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2029 int socklen = 0; 2030 int i; 2031 2032 for (i=0; i<xp->xfrm_nr; i++) { 2033 t = xp->xfrm_vec + i; 2034 socklen += pfkey_sockaddr_len(t->encap_family); 2035 } 2036 2037 return sizeof(struct sadb_msg) + 2038 (sizeof(struct sadb_lifetime) * 3) + 2039 (sizeof(struct sadb_address) * 2) + 2040 (sockaddr_size * 2) + 2041 sizeof(struct sadb_x_policy) + 2042 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 2043 (socklen * 2) + 2044 pfkey_xfrm_policy2sec_ctx_size(xp); 2045 } 2046 2047 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 2048 { 2049 struct sk_buff *skb; 2050 int size; 2051 2052 size = pfkey_xfrm_policy2msg_size(xp); 2053 2054 skb = alloc_skb(size + 16, GFP_ATOMIC); 2055 if (skb == NULL) 2056 return ERR_PTR(-ENOBUFS); 2057 2058 return skb; 2059 } 2060 2061 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2062 { 2063 struct sadb_msg *hdr; 2064 struct sadb_address *addr; 2065 struct sadb_lifetime *lifetime; 2066 struct sadb_x_policy *pol; 2067 struct sadb_x_sec_ctx *sec_ctx; 2068 struct xfrm_sec_ctx *xfrm_ctx; 2069 int i; 2070 int size; 2071 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2072 int socklen = pfkey_sockaddr_len(xp->family); 2073 2074 size = pfkey_xfrm_policy2msg_size(xp); 2075 2076 /* call should fill header later */ 2077 hdr = skb_put(skb, sizeof(struct sadb_msg)); 2078 memset(hdr, 0, size); /* XXX do we need this ? */ 2079 2080 /* src address */ 2081 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2082 addr->sadb_address_len = 2083 (sizeof(struct sadb_address)+sockaddr_size)/ 2084 sizeof(uint64_t); 2085 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2086 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2087 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2088 addr->sadb_address_reserved = 0; 2089 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2090 xp->selector.sport, 2091 (struct sockaddr *) (addr + 1), 2092 xp->family)) 2093 BUG(); 2094 2095 /* dst address */ 2096 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2097 addr->sadb_address_len = 2098 (sizeof(struct sadb_address)+sockaddr_size)/ 2099 sizeof(uint64_t); 2100 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2101 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2102 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2103 addr->sadb_address_reserved = 0; 2104 2105 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2106 (struct sockaddr *) (addr + 1), 2107 xp->family); 2108 2109 /* hard time */ 2110 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2111 lifetime->sadb_lifetime_len = 2112 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2113 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2114 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2115 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2116 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2117 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2118 /* soft time */ 2119 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2120 lifetime->sadb_lifetime_len = 2121 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2122 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2123 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2124 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2125 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2126 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2127 /* current time */ 2128 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2129 lifetime->sadb_lifetime_len = 2130 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2131 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2132 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2133 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2134 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2135 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2136 2137 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 2138 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2139 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2140 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2141 if (xp->action == XFRM_POLICY_ALLOW) { 2142 if (xp->xfrm_nr) 2143 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2144 else 2145 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2146 } 2147 pol->sadb_x_policy_dir = dir+1; 2148 pol->sadb_x_policy_reserved = 0; 2149 pol->sadb_x_policy_id = xp->index; 2150 pol->sadb_x_policy_priority = xp->priority; 2151 2152 for (i=0; i<xp->xfrm_nr; i++) { 2153 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2154 struct sadb_x_ipsecrequest *rq; 2155 int req_size; 2156 int mode; 2157 2158 req_size = sizeof(struct sadb_x_ipsecrequest); 2159 if (t->mode == XFRM_MODE_TUNNEL) { 2160 socklen = pfkey_sockaddr_len(t->encap_family); 2161 req_size += socklen * 2; 2162 } else { 2163 size -= 2*socklen; 2164 } 2165 rq = skb_put(skb, req_size); 2166 pol->sadb_x_policy_len += req_size/8; 2167 memset(rq, 0, sizeof(*rq)); 2168 rq->sadb_x_ipsecrequest_len = req_size; 2169 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2170 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2171 return -EINVAL; 2172 rq->sadb_x_ipsecrequest_mode = mode; 2173 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2174 if (t->reqid) 2175 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2176 if (t->optional) 2177 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2178 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2179 2180 if (t->mode == XFRM_MODE_TUNNEL) { 2181 u8 *sa = (void *)(rq + 1); 2182 pfkey_sockaddr_fill(&t->saddr, 0, 2183 (struct sockaddr *)sa, 2184 t->encap_family); 2185 pfkey_sockaddr_fill(&t->id.daddr, 0, 2186 (struct sockaddr *) (sa + socklen), 2187 t->encap_family); 2188 } 2189 } 2190 2191 /* security context */ 2192 if ((xfrm_ctx = xp->security)) { 2193 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2194 2195 sec_ctx = skb_put(skb, ctx_size); 2196 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2197 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2198 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2199 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2200 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2201 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2202 xfrm_ctx->ctx_len); 2203 } 2204 2205 hdr->sadb_msg_len = size / sizeof(uint64_t); 2206 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt); 2207 2208 return 0; 2209 } 2210 2211 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2212 { 2213 struct sk_buff *out_skb; 2214 struct sadb_msg *out_hdr; 2215 int err; 2216 2217 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2218 if (IS_ERR(out_skb)) 2219 return PTR_ERR(out_skb); 2220 2221 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2222 if (err < 0) { 2223 kfree_skb(out_skb); 2224 return err; 2225 } 2226 2227 out_hdr = (struct sadb_msg *) out_skb->data; 2228 out_hdr->sadb_msg_version = PF_KEY_V2; 2229 2230 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2231 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2232 else 2233 out_hdr->sadb_msg_type = event2poltype(c->event); 2234 out_hdr->sadb_msg_errno = 0; 2235 out_hdr->sadb_msg_seq = c->seq; 2236 out_hdr->sadb_msg_pid = c->portid; 2237 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2238 return 0; 2239 2240 } 2241 2242 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2243 { 2244 struct net *net = sock_net(sk); 2245 int err = 0; 2246 struct sadb_lifetime *lifetime; 2247 struct sadb_address *sa; 2248 struct sadb_x_policy *pol; 2249 struct xfrm_policy *xp; 2250 struct km_event c; 2251 struct sadb_x_sec_ctx *sec_ctx; 2252 2253 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2254 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2255 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2256 return -EINVAL; 2257 2258 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2259 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2260 return -EINVAL; 2261 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2262 return -EINVAL; 2263 2264 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2265 if (xp == NULL) 2266 return -ENOBUFS; 2267 2268 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2269 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2270 xp->priority = pol->sadb_x_policy_priority; 2271 2272 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2273 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2274 xp->selector.family = xp->family; 2275 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2276 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2277 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2278 if (xp->selector.sport) 2279 xp->selector.sport_mask = htons(0xffff); 2280 2281 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2282 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2283 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2284 2285 /* Amusing, we set this twice. KAME apps appear to set same value 2286 * in both addresses. 2287 */ 2288 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2289 2290 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2291 if (xp->selector.dport) 2292 xp->selector.dport_mask = htons(0xffff); 2293 2294 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2295 if (sec_ctx != NULL) { 2296 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2297 2298 if (!uctx) { 2299 err = -ENOBUFS; 2300 goto out; 2301 } 2302 2303 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2304 kfree(uctx); 2305 2306 if (err) 2307 goto out; 2308 } 2309 2310 xp->lft.soft_byte_limit = XFRM_INF; 2311 xp->lft.hard_byte_limit = XFRM_INF; 2312 xp->lft.soft_packet_limit = XFRM_INF; 2313 xp->lft.hard_packet_limit = XFRM_INF; 2314 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2315 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2316 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2317 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2318 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2319 } 2320 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2321 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2322 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2323 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2324 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2325 } 2326 xp->xfrm_nr = 0; 2327 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2328 (err = parse_ipsecrequests(xp, pol)) < 0) 2329 goto out; 2330 2331 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2332 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2333 2334 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2335 2336 if (err) 2337 goto out; 2338 2339 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2340 c.event = XFRM_MSG_UPDPOLICY; 2341 else 2342 c.event = XFRM_MSG_NEWPOLICY; 2343 2344 c.seq = hdr->sadb_msg_seq; 2345 c.portid = hdr->sadb_msg_pid; 2346 2347 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2348 xfrm_pol_put(xp); 2349 return 0; 2350 2351 out: 2352 xp->walk.dead = 1; 2353 xfrm_policy_destroy(xp); 2354 return err; 2355 } 2356 2357 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2358 { 2359 struct net *net = sock_net(sk); 2360 int err; 2361 struct sadb_address *sa; 2362 struct sadb_x_policy *pol; 2363 struct xfrm_policy *xp; 2364 struct xfrm_selector sel; 2365 struct km_event c; 2366 struct sadb_x_sec_ctx *sec_ctx; 2367 struct xfrm_sec_ctx *pol_ctx = NULL; 2368 2369 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2370 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2371 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2372 return -EINVAL; 2373 2374 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2375 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2376 return -EINVAL; 2377 2378 memset(&sel, 0, sizeof(sel)); 2379 2380 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2381 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2382 sel.prefixlen_s = sa->sadb_address_prefixlen; 2383 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2384 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2385 if (sel.sport) 2386 sel.sport_mask = htons(0xffff); 2387 2388 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2389 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2390 sel.prefixlen_d = sa->sadb_address_prefixlen; 2391 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2392 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2393 if (sel.dport) 2394 sel.dport_mask = htons(0xffff); 2395 2396 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2397 if (sec_ctx != NULL) { 2398 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2399 2400 if (!uctx) 2401 return -ENOMEM; 2402 2403 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2404 kfree(uctx); 2405 if (err) 2406 return err; 2407 } 2408 2409 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN, 2410 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2411 1, &err); 2412 security_xfrm_policy_free(pol_ctx); 2413 if (xp == NULL) 2414 return -ENOENT; 2415 2416 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2417 2418 if (err) 2419 goto out; 2420 2421 c.seq = hdr->sadb_msg_seq; 2422 c.portid = hdr->sadb_msg_pid; 2423 c.data.byid = 0; 2424 c.event = XFRM_MSG_DELPOLICY; 2425 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2426 2427 out: 2428 xfrm_pol_put(xp); 2429 return err; 2430 } 2431 2432 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2433 { 2434 int err; 2435 struct sk_buff *out_skb; 2436 struct sadb_msg *out_hdr; 2437 err = 0; 2438 2439 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2440 if (IS_ERR(out_skb)) { 2441 err = PTR_ERR(out_skb); 2442 goto out; 2443 } 2444 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2445 if (err < 0) 2446 goto out; 2447 2448 out_hdr = (struct sadb_msg *) out_skb->data; 2449 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2450 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2451 out_hdr->sadb_msg_satype = 0; 2452 out_hdr->sadb_msg_errno = 0; 2453 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2454 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2455 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2456 err = 0; 2457 2458 out: 2459 return err; 2460 } 2461 2462 static int pfkey_sockaddr_pair_size(sa_family_t family) 2463 { 2464 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2465 } 2466 2467 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2468 xfrm_address_t *saddr, xfrm_address_t *daddr, 2469 u16 *family) 2470 { 2471 int af, socklen; 2472 2473 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2474 return -EINVAL; 2475 2476 af = pfkey_sockaddr_extract(sa, saddr); 2477 if (!af) 2478 return -EINVAL; 2479 2480 socklen = pfkey_sockaddr_len(af); 2481 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2482 daddr) != af) 2483 return -EINVAL; 2484 2485 *family = af; 2486 return 0; 2487 } 2488 2489 #ifdef CONFIG_NET_KEY_MIGRATE 2490 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2491 struct xfrm_migrate *m) 2492 { 2493 int err; 2494 struct sadb_x_ipsecrequest *rq2; 2495 int mode; 2496 2497 if (len < sizeof(*rq1) || 2498 len < rq1->sadb_x_ipsecrequest_len || 2499 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) 2500 return -EINVAL; 2501 2502 /* old endoints */ 2503 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2504 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), 2505 &m->old_saddr, &m->old_daddr, 2506 &m->old_family); 2507 if (err) 2508 return err; 2509 2510 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2511 len -= rq1->sadb_x_ipsecrequest_len; 2512 2513 if (len <= sizeof(*rq2) || 2514 len < rq2->sadb_x_ipsecrequest_len || 2515 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) 2516 return -EINVAL; 2517 2518 /* new endpoints */ 2519 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2520 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), 2521 &m->new_saddr, &m->new_daddr, 2522 &m->new_family); 2523 if (err) 2524 return err; 2525 2526 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2527 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2528 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2529 return -EINVAL; 2530 2531 m->proto = rq1->sadb_x_ipsecrequest_proto; 2532 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2533 return -EINVAL; 2534 m->mode = mode; 2535 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2536 2537 return ((int)(rq1->sadb_x_ipsecrequest_len + 2538 rq2->sadb_x_ipsecrequest_len)); 2539 } 2540 2541 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2542 const struct sadb_msg *hdr, void * const *ext_hdrs) 2543 { 2544 int i, len, ret, err = -EINVAL; 2545 u8 dir; 2546 struct sadb_address *sa; 2547 struct sadb_x_kmaddress *kma; 2548 struct sadb_x_policy *pol; 2549 struct sadb_x_ipsecrequest *rq; 2550 struct xfrm_selector sel; 2551 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2552 struct xfrm_kmaddress k; 2553 struct net *net = sock_net(sk); 2554 2555 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2556 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2557 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2558 err = -EINVAL; 2559 goto out; 2560 } 2561 2562 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2563 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2564 2565 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2566 err = -EINVAL; 2567 goto out; 2568 } 2569 2570 if (kma) { 2571 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2572 k.reserved = kma->sadb_x_kmaddress_reserved; 2573 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2574 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2575 &k.local, &k.remote, &k.family); 2576 if (ret < 0) { 2577 err = ret; 2578 goto out; 2579 } 2580 } 2581 2582 dir = pol->sadb_x_policy_dir - 1; 2583 memset(&sel, 0, sizeof(sel)); 2584 2585 /* set source address info of selector */ 2586 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2587 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2588 sel.prefixlen_s = sa->sadb_address_prefixlen; 2589 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2590 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2591 if (sel.sport) 2592 sel.sport_mask = htons(0xffff); 2593 2594 /* set destination address info of selector */ 2595 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 2596 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2597 sel.prefixlen_d = sa->sadb_address_prefixlen; 2598 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2599 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2600 if (sel.dport) 2601 sel.dport_mask = htons(0xffff); 2602 2603 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2604 2605 /* extract ipsecrequests */ 2606 i = 0; 2607 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2608 2609 while (len > 0 && i < XFRM_MAX_DEPTH) { 2610 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2611 if (ret < 0) { 2612 err = ret; 2613 goto out; 2614 } else { 2615 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2616 len -= ret; 2617 i++; 2618 } 2619 } 2620 2621 if (!i || len > 0) { 2622 err = -EINVAL; 2623 goto out; 2624 } 2625 2626 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2627 kma ? &k : NULL, net, NULL); 2628 2629 out: 2630 return err; 2631 } 2632 #else 2633 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2634 const struct sadb_msg *hdr, void * const *ext_hdrs) 2635 { 2636 return -ENOPROTOOPT; 2637 } 2638 #endif 2639 2640 2641 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2642 { 2643 struct net *net = sock_net(sk); 2644 unsigned int dir; 2645 int err = 0, delete; 2646 struct sadb_x_policy *pol; 2647 struct xfrm_policy *xp; 2648 struct km_event c; 2649 2650 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2651 return -EINVAL; 2652 2653 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2654 if (dir >= XFRM_POLICY_MAX) 2655 return -EINVAL; 2656 2657 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2658 xp = xfrm_policy_byid(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN, 2659 dir, pol->sadb_x_policy_id, delete, &err); 2660 if (xp == NULL) 2661 return -ENOENT; 2662 2663 if (delete) { 2664 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2665 2666 if (err) 2667 goto out; 2668 c.seq = hdr->sadb_msg_seq; 2669 c.portid = hdr->sadb_msg_pid; 2670 c.data.byid = 1; 2671 c.event = XFRM_MSG_DELPOLICY; 2672 km_policy_notify(xp, dir, &c); 2673 } else { 2674 err = key_pol_get_resp(sk, xp, hdr, dir); 2675 } 2676 2677 out: 2678 xfrm_pol_put(xp); 2679 return err; 2680 } 2681 2682 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2683 { 2684 struct pfkey_sock *pfk = ptr; 2685 struct sk_buff *out_skb; 2686 struct sadb_msg *out_hdr; 2687 int err; 2688 2689 if (!pfkey_can_dump(&pfk->sk)) 2690 return -ENOBUFS; 2691 2692 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2693 if (IS_ERR(out_skb)) 2694 return PTR_ERR(out_skb); 2695 2696 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2697 if (err < 0) 2698 return err; 2699 2700 out_hdr = (struct sadb_msg *) out_skb->data; 2701 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2702 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2703 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2704 out_hdr->sadb_msg_errno = 0; 2705 out_hdr->sadb_msg_seq = count + 1; 2706 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2707 2708 if (pfk->dump.skb) 2709 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2710 &pfk->sk, sock_net(&pfk->sk)); 2711 pfk->dump.skb = out_skb; 2712 2713 return 0; 2714 } 2715 2716 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2717 { 2718 struct net *net = sock_net(&pfk->sk); 2719 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2720 } 2721 2722 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2723 { 2724 struct net *net = sock_net((struct sock *)pfk); 2725 2726 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2727 } 2728 2729 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2730 { 2731 struct pfkey_sock *pfk = pfkey_sk(sk); 2732 2733 mutex_lock(&pfk->dump_lock); 2734 if (pfk->dump.dump != NULL) { 2735 mutex_unlock(&pfk->dump_lock); 2736 return -EBUSY; 2737 } 2738 2739 pfk->dump.msg_version = hdr->sadb_msg_version; 2740 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2741 pfk->dump.dump = pfkey_dump_sp; 2742 pfk->dump.done = pfkey_dump_sp_done; 2743 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2744 mutex_unlock(&pfk->dump_lock); 2745 2746 return pfkey_do_dump(pfk); 2747 } 2748 2749 static int key_notify_policy_flush(const struct km_event *c) 2750 { 2751 struct sk_buff *skb_out; 2752 struct sadb_msg *hdr; 2753 2754 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2755 if (!skb_out) 2756 return -ENOBUFS; 2757 hdr = skb_put(skb_out, sizeof(struct sadb_msg)); 2758 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2759 hdr->sadb_msg_seq = c->seq; 2760 hdr->sadb_msg_pid = c->portid; 2761 hdr->sadb_msg_version = PF_KEY_V2; 2762 hdr->sadb_msg_errno = (uint8_t) 0; 2763 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2764 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2765 hdr->sadb_msg_reserved = 0; 2766 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2767 return 0; 2768 2769 } 2770 2771 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2772 { 2773 struct net *net = sock_net(sk); 2774 struct km_event c; 2775 int err, err2; 2776 2777 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2778 err2 = unicast_flush_resp(sk, hdr); 2779 if (err || err2) { 2780 if (err == -ESRCH) /* empty table - old silent behavior */ 2781 return 0; 2782 return err; 2783 } 2784 2785 c.data.type = XFRM_POLICY_TYPE_MAIN; 2786 c.event = XFRM_MSG_FLUSHPOLICY; 2787 c.portid = hdr->sadb_msg_pid; 2788 c.seq = hdr->sadb_msg_seq; 2789 c.net = net; 2790 km_policy_notify(NULL, 0, &c); 2791 2792 return 0; 2793 } 2794 2795 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2796 const struct sadb_msg *hdr, void * const *ext_hdrs); 2797 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2798 [SADB_RESERVED] = pfkey_reserved, 2799 [SADB_GETSPI] = pfkey_getspi, 2800 [SADB_UPDATE] = pfkey_add, 2801 [SADB_ADD] = pfkey_add, 2802 [SADB_DELETE] = pfkey_delete, 2803 [SADB_GET] = pfkey_get, 2804 [SADB_ACQUIRE] = pfkey_acquire, 2805 [SADB_REGISTER] = pfkey_register, 2806 [SADB_EXPIRE] = NULL, 2807 [SADB_FLUSH] = pfkey_flush, 2808 [SADB_DUMP] = pfkey_dump, 2809 [SADB_X_PROMISC] = pfkey_promisc, 2810 [SADB_X_PCHANGE] = NULL, 2811 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2812 [SADB_X_SPDADD] = pfkey_spdadd, 2813 [SADB_X_SPDDELETE] = pfkey_spddelete, 2814 [SADB_X_SPDGET] = pfkey_spdget, 2815 [SADB_X_SPDACQUIRE] = NULL, 2816 [SADB_X_SPDDUMP] = pfkey_spddump, 2817 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2818 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2819 [SADB_X_SPDDELETE2] = pfkey_spdget, 2820 [SADB_X_MIGRATE] = pfkey_migrate, 2821 }; 2822 2823 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2824 { 2825 void *ext_hdrs[SADB_EXT_MAX]; 2826 int err; 2827 2828 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2829 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2830 2831 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2832 err = parse_exthdrs(skb, hdr, ext_hdrs); 2833 if (!err) { 2834 err = -EOPNOTSUPP; 2835 if (pfkey_funcs[hdr->sadb_msg_type]) 2836 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2837 } 2838 return err; 2839 } 2840 2841 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2842 { 2843 struct sadb_msg *hdr = NULL; 2844 2845 if (skb->len < sizeof(*hdr)) { 2846 *errp = -EMSGSIZE; 2847 } else { 2848 hdr = (struct sadb_msg *) skb->data; 2849 if (hdr->sadb_msg_version != PF_KEY_V2 || 2850 hdr->sadb_msg_reserved != 0 || 2851 (hdr->sadb_msg_type <= SADB_RESERVED || 2852 hdr->sadb_msg_type > SADB_MAX)) { 2853 hdr = NULL; 2854 *errp = -EINVAL; 2855 } else if (hdr->sadb_msg_len != (skb->len / 2856 sizeof(uint64_t)) || 2857 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2858 sizeof(uint64_t))) { 2859 hdr = NULL; 2860 *errp = -EMSGSIZE; 2861 } else { 2862 *errp = 0; 2863 } 2864 } 2865 return hdr; 2866 } 2867 2868 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2869 const struct xfrm_algo_desc *d) 2870 { 2871 unsigned int id = d->desc.sadb_alg_id; 2872 2873 if (id >= sizeof(t->aalgos) * 8) 2874 return 0; 2875 2876 return (t->aalgos >> id) & 1; 2877 } 2878 2879 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2880 const struct xfrm_algo_desc *d) 2881 { 2882 unsigned int id = d->desc.sadb_alg_id; 2883 2884 if (id >= sizeof(t->ealgos) * 8) 2885 return 0; 2886 2887 return (t->ealgos >> id) & 1; 2888 } 2889 2890 static int count_ah_combs(const struct xfrm_tmpl *t) 2891 { 2892 int i, sz = 0; 2893 2894 for (i = 0; ; i++) { 2895 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2896 if (!aalg) 2897 break; 2898 if (!aalg->pfkey_supported) 2899 continue; 2900 if (aalg_tmpl_set(t, aalg) && aalg->available) 2901 sz += sizeof(struct sadb_comb); 2902 } 2903 return sz + sizeof(struct sadb_prop); 2904 } 2905 2906 static int count_esp_combs(const struct xfrm_tmpl *t) 2907 { 2908 int i, k, sz = 0; 2909 2910 for (i = 0; ; i++) { 2911 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2912 if (!ealg) 2913 break; 2914 2915 if (!ealg->pfkey_supported) 2916 continue; 2917 2918 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2919 continue; 2920 2921 for (k = 1; ; k++) { 2922 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2923 if (!aalg) 2924 break; 2925 2926 if (!aalg->pfkey_supported) 2927 continue; 2928 2929 if (aalg_tmpl_set(t, aalg) && aalg->available) 2930 sz += sizeof(struct sadb_comb); 2931 } 2932 } 2933 return sz + sizeof(struct sadb_prop); 2934 } 2935 2936 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2937 { 2938 struct sadb_prop *p; 2939 int i; 2940 2941 p = skb_put(skb, sizeof(struct sadb_prop)); 2942 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2943 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2944 p->sadb_prop_replay = 32; 2945 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2946 2947 for (i = 0; ; i++) { 2948 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2949 if (!aalg) 2950 break; 2951 2952 if (!aalg->pfkey_supported) 2953 continue; 2954 2955 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2956 struct sadb_comb *c; 2957 c = skb_put_zero(skb, sizeof(struct sadb_comb)); 2958 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2959 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2960 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2961 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2962 c->sadb_comb_hard_addtime = 24*60*60; 2963 c->sadb_comb_soft_addtime = 20*60*60; 2964 c->sadb_comb_hard_usetime = 8*60*60; 2965 c->sadb_comb_soft_usetime = 7*60*60; 2966 } 2967 } 2968 } 2969 2970 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2971 { 2972 struct sadb_prop *p; 2973 int i, k; 2974 2975 p = skb_put(skb, sizeof(struct sadb_prop)); 2976 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2977 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2978 p->sadb_prop_replay = 32; 2979 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2980 2981 for (i=0; ; i++) { 2982 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2983 if (!ealg) 2984 break; 2985 2986 if (!ealg->pfkey_supported) 2987 continue; 2988 2989 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2990 continue; 2991 2992 for (k = 1; ; k++) { 2993 struct sadb_comb *c; 2994 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2995 if (!aalg) 2996 break; 2997 if (!aalg->pfkey_supported) 2998 continue; 2999 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 3000 continue; 3001 c = skb_put(skb, sizeof(struct sadb_comb)); 3002 memset(c, 0, sizeof(*c)); 3003 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 3004 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 3005 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 3006 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 3007 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 3008 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 3009 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 3010 c->sadb_comb_hard_addtime = 24*60*60; 3011 c->sadb_comb_soft_addtime = 20*60*60; 3012 c->sadb_comb_hard_usetime = 8*60*60; 3013 c->sadb_comb_soft_usetime = 7*60*60; 3014 } 3015 } 3016 } 3017 3018 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 3019 { 3020 return 0; 3021 } 3022 3023 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 3024 { 3025 struct sk_buff *out_skb; 3026 struct sadb_msg *out_hdr; 3027 int hard; 3028 int hsc; 3029 3030 hard = c->data.hard; 3031 if (hard) 3032 hsc = 2; 3033 else 3034 hsc = 1; 3035 3036 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 3037 if (IS_ERR(out_skb)) 3038 return PTR_ERR(out_skb); 3039 3040 out_hdr = (struct sadb_msg *) out_skb->data; 3041 out_hdr->sadb_msg_version = PF_KEY_V2; 3042 out_hdr->sadb_msg_type = SADB_EXPIRE; 3043 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3044 out_hdr->sadb_msg_errno = 0; 3045 out_hdr->sadb_msg_reserved = 0; 3046 out_hdr->sadb_msg_seq = 0; 3047 out_hdr->sadb_msg_pid = 0; 3048 3049 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3050 xs_net(x)); 3051 return 0; 3052 } 3053 3054 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3055 { 3056 struct net *net = x ? xs_net(x) : c->net; 3057 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3058 3059 if (atomic_read(&net_pfkey->socks_nr) == 0) 3060 return 0; 3061 3062 switch (c->event) { 3063 case XFRM_MSG_EXPIRE: 3064 return key_notify_sa_expire(x, c); 3065 case XFRM_MSG_DELSA: 3066 case XFRM_MSG_NEWSA: 3067 case XFRM_MSG_UPDSA: 3068 return key_notify_sa(x, c); 3069 case XFRM_MSG_FLUSHSA: 3070 return key_notify_sa_flush(c); 3071 case XFRM_MSG_NEWAE: /* not yet supported */ 3072 break; 3073 default: 3074 pr_err("pfkey: Unknown SA event %d\n", c->event); 3075 break; 3076 } 3077 3078 return 0; 3079 } 3080 3081 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3082 { 3083 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3084 return 0; 3085 3086 switch (c->event) { 3087 case XFRM_MSG_POLEXPIRE: 3088 return key_notify_policy_expire(xp, c); 3089 case XFRM_MSG_DELPOLICY: 3090 case XFRM_MSG_NEWPOLICY: 3091 case XFRM_MSG_UPDPOLICY: 3092 return key_notify_policy(xp, dir, c); 3093 case XFRM_MSG_FLUSHPOLICY: 3094 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3095 break; 3096 return key_notify_policy_flush(c); 3097 default: 3098 pr_err("pfkey: Unknown policy event %d\n", c->event); 3099 break; 3100 } 3101 3102 return 0; 3103 } 3104 3105 static u32 get_acqseq(void) 3106 { 3107 u32 res; 3108 static atomic_t acqseq; 3109 3110 do { 3111 res = atomic_inc_return(&acqseq); 3112 } while (!res); 3113 return res; 3114 } 3115 3116 static bool pfkey_is_alive(const struct km_event *c) 3117 { 3118 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3119 struct sock *sk; 3120 bool is_alive = false; 3121 3122 rcu_read_lock(); 3123 sk_for_each_rcu(sk, &net_pfkey->table) { 3124 if (pfkey_sk(sk)->registered) { 3125 is_alive = true; 3126 break; 3127 } 3128 } 3129 rcu_read_unlock(); 3130 3131 return is_alive; 3132 } 3133 3134 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3135 { 3136 struct sk_buff *skb; 3137 struct sadb_msg *hdr; 3138 struct sadb_address *addr; 3139 struct sadb_x_policy *pol; 3140 int sockaddr_size; 3141 int size; 3142 struct sadb_x_sec_ctx *sec_ctx; 3143 struct xfrm_sec_ctx *xfrm_ctx; 3144 int ctx_size = 0; 3145 3146 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3147 if (!sockaddr_size) 3148 return -EINVAL; 3149 3150 size = sizeof(struct sadb_msg) + 3151 (sizeof(struct sadb_address) * 2) + 3152 (sockaddr_size * 2) + 3153 sizeof(struct sadb_x_policy); 3154 3155 if (x->id.proto == IPPROTO_AH) 3156 size += count_ah_combs(t); 3157 else if (x->id.proto == IPPROTO_ESP) 3158 size += count_esp_combs(t); 3159 3160 if ((xfrm_ctx = x->security)) { 3161 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3162 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3163 } 3164 3165 skb = alloc_skb(size + 16, GFP_ATOMIC); 3166 if (skb == NULL) 3167 return -ENOMEM; 3168 3169 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3170 hdr->sadb_msg_version = PF_KEY_V2; 3171 hdr->sadb_msg_type = SADB_ACQUIRE; 3172 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3173 hdr->sadb_msg_len = size / sizeof(uint64_t); 3174 hdr->sadb_msg_errno = 0; 3175 hdr->sadb_msg_reserved = 0; 3176 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3177 hdr->sadb_msg_pid = 0; 3178 3179 /* src address */ 3180 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3181 addr->sadb_address_len = 3182 (sizeof(struct sadb_address)+sockaddr_size)/ 3183 sizeof(uint64_t); 3184 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3185 addr->sadb_address_proto = 0; 3186 addr->sadb_address_reserved = 0; 3187 addr->sadb_address_prefixlen = 3188 pfkey_sockaddr_fill(&x->props.saddr, 0, 3189 (struct sockaddr *) (addr + 1), 3190 x->props.family); 3191 if (!addr->sadb_address_prefixlen) 3192 BUG(); 3193 3194 /* dst address */ 3195 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3196 addr->sadb_address_len = 3197 (sizeof(struct sadb_address)+sockaddr_size)/ 3198 sizeof(uint64_t); 3199 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3200 addr->sadb_address_proto = 0; 3201 addr->sadb_address_reserved = 0; 3202 addr->sadb_address_prefixlen = 3203 pfkey_sockaddr_fill(&x->id.daddr, 0, 3204 (struct sockaddr *) (addr + 1), 3205 x->props.family); 3206 if (!addr->sadb_address_prefixlen) 3207 BUG(); 3208 3209 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3210 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3211 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3212 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3213 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3214 pol->sadb_x_policy_reserved = 0; 3215 pol->sadb_x_policy_id = xp->index; 3216 pol->sadb_x_policy_priority = xp->priority; 3217 3218 /* Set sadb_comb's. */ 3219 if (x->id.proto == IPPROTO_AH) 3220 dump_ah_combs(skb, t); 3221 else if (x->id.proto == IPPROTO_ESP) 3222 dump_esp_combs(skb, t); 3223 3224 /* security context */ 3225 if (xfrm_ctx) { 3226 sec_ctx = skb_put(skb, 3227 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3228 sec_ctx->sadb_x_sec_len = 3229 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3230 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3231 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3232 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3233 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3234 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3235 xfrm_ctx->ctx_len); 3236 } 3237 3238 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3239 xs_net(x)); 3240 } 3241 3242 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3243 u8 *data, int len, int *dir) 3244 { 3245 struct net *net = sock_net(sk); 3246 struct xfrm_policy *xp; 3247 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3248 struct sadb_x_sec_ctx *sec_ctx; 3249 3250 switch (sk->sk_family) { 3251 case AF_INET: 3252 if (opt != IP_IPSEC_POLICY) { 3253 *dir = -EOPNOTSUPP; 3254 return NULL; 3255 } 3256 break; 3257 #if IS_ENABLED(CONFIG_IPV6) 3258 case AF_INET6: 3259 if (opt != IPV6_IPSEC_POLICY) { 3260 *dir = -EOPNOTSUPP; 3261 return NULL; 3262 } 3263 break; 3264 #endif 3265 default: 3266 *dir = -EINVAL; 3267 return NULL; 3268 } 3269 3270 *dir = -EINVAL; 3271 3272 if (len < sizeof(struct sadb_x_policy) || 3273 pol->sadb_x_policy_len*8 > len || 3274 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3275 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3276 return NULL; 3277 3278 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3279 if (xp == NULL) { 3280 *dir = -ENOBUFS; 3281 return NULL; 3282 } 3283 3284 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3285 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3286 3287 xp->lft.soft_byte_limit = XFRM_INF; 3288 xp->lft.hard_byte_limit = XFRM_INF; 3289 xp->lft.soft_packet_limit = XFRM_INF; 3290 xp->lft.hard_packet_limit = XFRM_INF; 3291 xp->family = sk->sk_family; 3292 3293 xp->xfrm_nr = 0; 3294 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3295 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3296 goto out; 3297 3298 /* security context too */ 3299 if (len >= (pol->sadb_x_policy_len*8 + 3300 sizeof(struct sadb_x_sec_ctx))) { 3301 char *p = (char *)pol; 3302 struct xfrm_user_sec_ctx *uctx; 3303 3304 p += pol->sadb_x_policy_len*8; 3305 sec_ctx = (struct sadb_x_sec_ctx *)p; 3306 if (len < pol->sadb_x_policy_len*8 + 3307 sec_ctx->sadb_x_sec_len*8) { 3308 *dir = -EINVAL; 3309 goto out; 3310 } 3311 if ((*dir = verify_sec_ctx_len(p))) 3312 goto out; 3313 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3314 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3315 kfree(uctx); 3316 3317 if (*dir) 3318 goto out; 3319 } 3320 3321 *dir = pol->sadb_x_policy_dir-1; 3322 return xp; 3323 3324 out: 3325 xp->walk.dead = 1; 3326 xfrm_policy_destroy(xp); 3327 return NULL; 3328 } 3329 3330 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3331 { 3332 struct sk_buff *skb; 3333 struct sadb_msg *hdr; 3334 struct sadb_sa *sa; 3335 struct sadb_address *addr; 3336 struct sadb_x_nat_t_port *n_port; 3337 int sockaddr_size; 3338 int size; 3339 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3340 struct xfrm_encap_tmpl *natt = NULL; 3341 3342 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3343 if (!sockaddr_size) 3344 return -EINVAL; 3345 3346 if (!satype) 3347 return -EINVAL; 3348 3349 if (!x->encap) 3350 return -EINVAL; 3351 3352 natt = x->encap; 3353 3354 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3355 * 3356 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3357 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3358 */ 3359 3360 size = sizeof(struct sadb_msg) + 3361 sizeof(struct sadb_sa) + 3362 (sizeof(struct sadb_address) * 2) + 3363 (sockaddr_size * 2) + 3364 (sizeof(struct sadb_x_nat_t_port) * 2); 3365 3366 skb = alloc_skb(size + 16, GFP_ATOMIC); 3367 if (skb == NULL) 3368 return -ENOMEM; 3369 3370 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3371 hdr->sadb_msg_version = PF_KEY_V2; 3372 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3373 hdr->sadb_msg_satype = satype; 3374 hdr->sadb_msg_len = size / sizeof(uint64_t); 3375 hdr->sadb_msg_errno = 0; 3376 hdr->sadb_msg_reserved = 0; 3377 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3378 hdr->sadb_msg_pid = 0; 3379 3380 /* SA */ 3381 sa = skb_put(skb, sizeof(struct sadb_sa)); 3382 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3383 sa->sadb_sa_exttype = SADB_EXT_SA; 3384 sa->sadb_sa_spi = x->id.spi; 3385 sa->sadb_sa_replay = 0; 3386 sa->sadb_sa_state = 0; 3387 sa->sadb_sa_auth = 0; 3388 sa->sadb_sa_encrypt = 0; 3389 sa->sadb_sa_flags = 0; 3390 3391 /* ADDRESS_SRC (old addr) */ 3392 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3393 addr->sadb_address_len = 3394 (sizeof(struct sadb_address)+sockaddr_size)/ 3395 sizeof(uint64_t); 3396 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3397 addr->sadb_address_proto = 0; 3398 addr->sadb_address_reserved = 0; 3399 addr->sadb_address_prefixlen = 3400 pfkey_sockaddr_fill(&x->props.saddr, 0, 3401 (struct sockaddr *) (addr + 1), 3402 x->props.family); 3403 if (!addr->sadb_address_prefixlen) 3404 BUG(); 3405 3406 /* NAT_T_SPORT (old port) */ 3407 n_port = skb_put(skb, sizeof(*n_port)); 3408 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3409 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3410 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3411 n_port->sadb_x_nat_t_port_reserved = 0; 3412 3413 /* ADDRESS_DST (new addr) */ 3414 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3415 addr->sadb_address_len = 3416 (sizeof(struct sadb_address)+sockaddr_size)/ 3417 sizeof(uint64_t); 3418 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3419 addr->sadb_address_proto = 0; 3420 addr->sadb_address_reserved = 0; 3421 addr->sadb_address_prefixlen = 3422 pfkey_sockaddr_fill(ipaddr, 0, 3423 (struct sockaddr *) (addr + 1), 3424 x->props.family); 3425 if (!addr->sadb_address_prefixlen) 3426 BUG(); 3427 3428 /* NAT_T_DPORT (new port) */ 3429 n_port = skb_put(skb, sizeof(*n_port)); 3430 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3431 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3432 n_port->sadb_x_nat_t_port_port = sport; 3433 n_port->sadb_x_nat_t_port_reserved = 0; 3434 3435 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3436 xs_net(x)); 3437 } 3438 3439 #ifdef CONFIG_NET_KEY_MIGRATE 3440 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3441 const struct xfrm_selector *sel) 3442 { 3443 struct sadb_address *addr; 3444 addr = skb_put(skb, sizeof(struct sadb_address) + sasize); 3445 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3446 addr->sadb_address_exttype = type; 3447 addr->sadb_address_proto = sel->proto; 3448 addr->sadb_address_reserved = 0; 3449 3450 switch (type) { 3451 case SADB_EXT_ADDRESS_SRC: 3452 addr->sadb_address_prefixlen = sel->prefixlen_s; 3453 pfkey_sockaddr_fill(&sel->saddr, 0, 3454 (struct sockaddr *)(addr + 1), 3455 sel->family); 3456 break; 3457 case SADB_EXT_ADDRESS_DST: 3458 addr->sadb_address_prefixlen = sel->prefixlen_d; 3459 pfkey_sockaddr_fill(&sel->daddr, 0, 3460 (struct sockaddr *)(addr + 1), 3461 sel->family); 3462 break; 3463 default: 3464 return -EINVAL; 3465 } 3466 3467 return 0; 3468 } 3469 3470 3471 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3472 { 3473 struct sadb_x_kmaddress *kma; 3474 u8 *sa; 3475 int family = k->family; 3476 int socklen = pfkey_sockaddr_len(family); 3477 int size_req; 3478 3479 size_req = (sizeof(struct sadb_x_kmaddress) + 3480 pfkey_sockaddr_pair_size(family)); 3481 3482 kma = skb_put_zero(skb, size_req); 3483 kma->sadb_x_kmaddress_len = size_req / 8; 3484 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3485 kma->sadb_x_kmaddress_reserved = k->reserved; 3486 3487 sa = (u8 *)(kma + 1); 3488 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3489 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3490 return -EINVAL; 3491 3492 return 0; 3493 } 3494 3495 static int set_ipsecrequest(struct sk_buff *skb, 3496 uint8_t proto, uint8_t mode, int level, 3497 uint32_t reqid, uint8_t family, 3498 const xfrm_address_t *src, const xfrm_address_t *dst) 3499 { 3500 struct sadb_x_ipsecrequest *rq; 3501 u8 *sa; 3502 int socklen = pfkey_sockaddr_len(family); 3503 int size_req; 3504 3505 size_req = sizeof(struct sadb_x_ipsecrequest) + 3506 pfkey_sockaddr_pair_size(family); 3507 3508 rq = skb_put_zero(skb, size_req); 3509 rq->sadb_x_ipsecrequest_len = size_req; 3510 rq->sadb_x_ipsecrequest_proto = proto; 3511 rq->sadb_x_ipsecrequest_mode = mode; 3512 rq->sadb_x_ipsecrequest_level = level; 3513 rq->sadb_x_ipsecrequest_reqid = reqid; 3514 3515 sa = (u8 *) (rq + 1); 3516 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3517 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3518 return -EINVAL; 3519 3520 return 0; 3521 } 3522 #endif 3523 3524 #ifdef CONFIG_NET_KEY_MIGRATE 3525 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3526 const struct xfrm_migrate *m, int num_bundles, 3527 const struct xfrm_kmaddress *k, 3528 const struct xfrm_encap_tmpl *encap) 3529 { 3530 int i; 3531 int sasize_sel; 3532 int size = 0; 3533 int size_pol = 0; 3534 struct sk_buff *skb; 3535 struct sadb_msg *hdr; 3536 struct sadb_x_policy *pol; 3537 const struct xfrm_migrate *mp; 3538 3539 if (type != XFRM_POLICY_TYPE_MAIN) 3540 return 0; 3541 3542 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3543 return -EINVAL; 3544 3545 if (k != NULL) { 3546 /* addresses for KM */ 3547 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3548 pfkey_sockaddr_pair_size(k->family)); 3549 } 3550 3551 /* selector */ 3552 sasize_sel = pfkey_sockaddr_size(sel->family); 3553 if (!sasize_sel) 3554 return -EINVAL; 3555 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3556 3557 /* policy info */ 3558 size_pol += sizeof(struct sadb_x_policy); 3559 3560 /* ipsecrequests */ 3561 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3562 /* old locator pair */ 3563 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3564 pfkey_sockaddr_pair_size(mp->old_family); 3565 /* new locator pair */ 3566 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3567 pfkey_sockaddr_pair_size(mp->new_family); 3568 } 3569 3570 size += sizeof(struct sadb_msg) + size_pol; 3571 3572 /* alloc buffer */ 3573 skb = alloc_skb(size, GFP_ATOMIC); 3574 if (skb == NULL) 3575 return -ENOMEM; 3576 3577 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3578 hdr->sadb_msg_version = PF_KEY_V2; 3579 hdr->sadb_msg_type = SADB_X_MIGRATE; 3580 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3581 hdr->sadb_msg_len = size / 8; 3582 hdr->sadb_msg_errno = 0; 3583 hdr->sadb_msg_reserved = 0; 3584 hdr->sadb_msg_seq = 0; 3585 hdr->sadb_msg_pid = 0; 3586 3587 /* Addresses to be used by KM for negotiation, if ext is available */ 3588 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3589 goto err; 3590 3591 /* selector src */ 3592 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3593 3594 /* selector dst */ 3595 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3596 3597 /* policy information */ 3598 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3599 pol->sadb_x_policy_len = size_pol / 8; 3600 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3601 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3602 pol->sadb_x_policy_dir = dir + 1; 3603 pol->sadb_x_policy_reserved = 0; 3604 pol->sadb_x_policy_id = 0; 3605 pol->sadb_x_policy_priority = 0; 3606 3607 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3608 /* old ipsecrequest */ 3609 int mode = pfkey_mode_from_xfrm(mp->mode); 3610 if (mode < 0) 3611 goto err; 3612 if (set_ipsecrequest(skb, mp->proto, mode, 3613 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3614 mp->reqid, mp->old_family, 3615 &mp->old_saddr, &mp->old_daddr) < 0) 3616 goto err; 3617 3618 /* new ipsecrequest */ 3619 if (set_ipsecrequest(skb, mp->proto, mode, 3620 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3621 mp->reqid, mp->new_family, 3622 &mp->new_saddr, &mp->new_daddr) < 0) 3623 goto err; 3624 } 3625 3626 /* broadcast migrate message to sockets */ 3627 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3628 3629 return 0; 3630 3631 err: 3632 kfree_skb(skb); 3633 return -EINVAL; 3634 } 3635 #else 3636 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3637 const struct xfrm_migrate *m, int num_bundles, 3638 const struct xfrm_kmaddress *k, 3639 const struct xfrm_encap_tmpl *encap) 3640 { 3641 return -ENOPROTOOPT; 3642 } 3643 #endif 3644 3645 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 3646 { 3647 struct sock *sk = sock->sk; 3648 struct sk_buff *skb = NULL; 3649 struct sadb_msg *hdr = NULL; 3650 int err; 3651 struct net *net = sock_net(sk); 3652 3653 err = -EOPNOTSUPP; 3654 if (msg->msg_flags & MSG_OOB) 3655 goto out; 3656 3657 err = -EMSGSIZE; 3658 if ((unsigned int)len > sk->sk_sndbuf - 32) 3659 goto out; 3660 3661 err = -ENOBUFS; 3662 skb = alloc_skb(len, GFP_KERNEL); 3663 if (skb == NULL) 3664 goto out; 3665 3666 err = -EFAULT; 3667 if (memcpy_from_msg(skb_put(skb,len), msg, len)) 3668 goto out; 3669 3670 hdr = pfkey_get_base_msg(skb, &err); 3671 if (!hdr) 3672 goto out; 3673 3674 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3675 err = pfkey_process(sk, skb, hdr); 3676 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3677 3678 out: 3679 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3680 err = 0; 3681 kfree_skb(skb); 3682 3683 return err ? : len; 3684 } 3685 3686 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 3687 int flags) 3688 { 3689 struct sock *sk = sock->sk; 3690 struct pfkey_sock *pfk = pfkey_sk(sk); 3691 struct sk_buff *skb; 3692 int copied, err; 3693 3694 err = -EINVAL; 3695 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3696 goto out; 3697 3698 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3699 if (skb == NULL) 3700 goto out; 3701 3702 copied = skb->len; 3703 if (copied > len) { 3704 msg->msg_flags |= MSG_TRUNC; 3705 copied = len; 3706 } 3707 3708 skb_reset_transport_header(skb); 3709 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3710 if (err) 3711 goto out_free; 3712 3713 sock_recv_ts_and_drops(msg, sk, skb); 3714 3715 err = (flags & MSG_TRUNC) ? skb->len : copied; 3716 3717 if (pfk->dump.dump != NULL && 3718 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3719 pfkey_do_dump(pfk); 3720 3721 out_free: 3722 skb_free_datagram(sk, skb); 3723 out: 3724 return err; 3725 } 3726 3727 static const struct proto_ops pfkey_ops = { 3728 .family = PF_KEY, 3729 .owner = THIS_MODULE, 3730 /* Operations that make no sense on pfkey sockets. */ 3731 .bind = sock_no_bind, 3732 .connect = sock_no_connect, 3733 .socketpair = sock_no_socketpair, 3734 .accept = sock_no_accept, 3735 .getname = sock_no_getname, 3736 .ioctl = sock_no_ioctl, 3737 .listen = sock_no_listen, 3738 .shutdown = sock_no_shutdown, 3739 .setsockopt = sock_no_setsockopt, 3740 .getsockopt = sock_no_getsockopt, 3741 .mmap = sock_no_mmap, 3742 .sendpage = sock_no_sendpage, 3743 3744 /* Now the operations that really occur. */ 3745 .release = pfkey_release, 3746 .poll = datagram_poll, 3747 .sendmsg = pfkey_sendmsg, 3748 .recvmsg = pfkey_recvmsg, 3749 }; 3750 3751 static const struct net_proto_family pfkey_family_ops = { 3752 .family = PF_KEY, 3753 .create = pfkey_create, 3754 .owner = THIS_MODULE, 3755 }; 3756 3757 #ifdef CONFIG_PROC_FS 3758 static int pfkey_seq_show(struct seq_file *f, void *v) 3759 { 3760 struct sock *s = sk_entry(v); 3761 3762 if (v == SEQ_START_TOKEN) 3763 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3764 else 3765 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3766 s, 3767 refcount_read(&s->sk_refcnt), 3768 sk_rmem_alloc_get(s), 3769 sk_wmem_alloc_get(s), 3770 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3771 sock_i_ino(s) 3772 ); 3773 return 0; 3774 } 3775 3776 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3777 __acquires(rcu) 3778 { 3779 struct net *net = seq_file_net(f); 3780 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3781 3782 rcu_read_lock(); 3783 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3784 } 3785 3786 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3787 { 3788 struct net *net = seq_file_net(f); 3789 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3790 3791 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3792 } 3793 3794 static void pfkey_seq_stop(struct seq_file *f, void *v) 3795 __releases(rcu) 3796 { 3797 rcu_read_unlock(); 3798 } 3799 3800 static const struct seq_operations pfkey_seq_ops = { 3801 .start = pfkey_seq_start, 3802 .next = pfkey_seq_next, 3803 .stop = pfkey_seq_stop, 3804 .show = pfkey_seq_show, 3805 }; 3806 3807 static int __net_init pfkey_init_proc(struct net *net) 3808 { 3809 struct proc_dir_entry *e; 3810 3811 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops, 3812 sizeof(struct seq_net_private)); 3813 if (e == NULL) 3814 return -ENOMEM; 3815 3816 return 0; 3817 } 3818 3819 static void __net_exit pfkey_exit_proc(struct net *net) 3820 { 3821 remove_proc_entry("pfkey", net->proc_net); 3822 } 3823 #else 3824 static inline int pfkey_init_proc(struct net *net) 3825 { 3826 return 0; 3827 } 3828 3829 static inline void pfkey_exit_proc(struct net *net) 3830 { 3831 } 3832 #endif 3833 3834 static struct xfrm_mgr pfkeyv2_mgr = 3835 { 3836 .notify = pfkey_send_notify, 3837 .acquire = pfkey_send_acquire, 3838 .compile_policy = pfkey_compile_policy, 3839 .new_mapping = pfkey_send_new_mapping, 3840 .notify_policy = pfkey_send_policy_notify, 3841 .migrate = pfkey_send_migrate, 3842 .is_alive = pfkey_is_alive, 3843 }; 3844 3845 static int __net_init pfkey_net_init(struct net *net) 3846 { 3847 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3848 int rv; 3849 3850 INIT_HLIST_HEAD(&net_pfkey->table); 3851 atomic_set(&net_pfkey->socks_nr, 0); 3852 3853 rv = pfkey_init_proc(net); 3854 3855 return rv; 3856 } 3857 3858 static void __net_exit pfkey_net_exit(struct net *net) 3859 { 3860 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3861 3862 pfkey_exit_proc(net); 3863 WARN_ON(!hlist_empty(&net_pfkey->table)); 3864 } 3865 3866 static struct pernet_operations pfkey_net_ops = { 3867 .init = pfkey_net_init, 3868 .exit = pfkey_net_exit, 3869 .id = &pfkey_net_id, 3870 .size = sizeof(struct netns_pfkey), 3871 }; 3872 3873 static void __exit ipsec_pfkey_exit(void) 3874 { 3875 xfrm_unregister_km(&pfkeyv2_mgr); 3876 sock_unregister(PF_KEY); 3877 unregister_pernet_subsys(&pfkey_net_ops); 3878 proto_unregister(&key_proto); 3879 } 3880 3881 static int __init ipsec_pfkey_init(void) 3882 { 3883 int err = proto_register(&key_proto, 0); 3884 3885 if (err != 0) 3886 goto out; 3887 3888 err = register_pernet_subsys(&pfkey_net_ops); 3889 if (err != 0) 3890 goto out_unregister_key_proto; 3891 err = sock_register(&pfkey_family_ops); 3892 if (err != 0) 3893 goto out_unregister_pernet; 3894 err = xfrm_register_km(&pfkeyv2_mgr); 3895 if (err != 0) 3896 goto out_sock_unregister; 3897 out: 3898 return err; 3899 3900 out_sock_unregister: 3901 sock_unregister(PF_KEY); 3902 out_unregister_pernet: 3903 unregister_pernet_subsys(&pfkey_net_ops); 3904 out_unregister_key_proto: 3905 proto_unregister(&key_proto); 3906 goto out; 3907 } 3908 3909 module_init(ipsec_pfkey_init); 3910 module_exit(ipsec_pfkey_exit); 3911 MODULE_LICENSE("GPL"); 3912 MODULE_ALIAS_NETPROTO(PF_KEY); 3913